WO2017014010A1 - Antenna device and electronic device - Google Patents

Antenna device and electronic device Download PDF

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Publication number
WO2017014010A1
WO2017014010A1 PCT/JP2016/069103 JP2016069103W WO2017014010A1 WO 2017014010 A1 WO2017014010 A1 WO 2017014010A1 JP 2016069103 W JP2016069103 W JP 2016069103W WO 2017014010 A1 WO2017014010 A1 WO 2017014010A1
Authority
WO
WIPO (PCT)
Prior art keywords
diffusion sheet
antenna
antenna coil
thermal diffusion
slit
Prior art date
Application number
PCT/JP2016/069103
Other languages
French (fr)
Japanese (ja)
Inventor
折原　勝久
憲男 斎藤
雅裕 幸保
Original Assignee
デクセリアルズ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by デクセリアルズ株式会社 filed Critical デクセリアルズ株式会社
Priority to US15/745,919 priority Critical patent/US10936934B2/en
Priority to CN201680040627.7A priority patent/CN107851899B/en
Publication of WO2017014010A1 publication Critical patent/WO2017014010A1/en

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • G06K19/07773—Antenna details
    • G06K19/07777—Antenna details the antenna being of the inductive type
    • G06K19/07779—Antenna details the antenna being of the inductive type the inductive antenna being a coil
    • G06K19/07783—Antenna details the antenna being of the inductive type the inductive antenna being a coil the coil being planar
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/02—Arrangements for de-icing; Arrangements for drying-out ; Arrangements for cooling; Arrangements for preventing corrosion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H01Q1/2216—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in interrogator/reader equipment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas

Definitions

  • the present invention relates to an antenna device that is incorporated in an electronic device and communicates with an external device such as a transmitter via an electromagnetic field signal, and an electronic device in which the antenna device is incorporated.
  • an antenna module for RFID Radio Frequency Identification
  • This antenna module performs communication using an inductive coupling with an antenna coil mounted on a transmitter such as a reader / writer. That is, in this antenna module, when the antenna coil receives the magnetic field from the reader / writer, the antenna coil can convert it into electric power and drive an IC that functions as a communication processing unit.
  • the antenna module needs to receive a magnetic flux of a certain value or more from the reader / writer with the antenna coil in order to reliably communicate. Therefore, in the antenna module according to the conventional example, a loop coil is provided in the casing of the mobile phone, and the coil receives the magnetic flux from the reader / writer.
  • the antenna module incorporated in an electronic device such as a cellular phone has a magnetic flux from the reader / writer rebounded due to an eddy current generated when a metal such as a substrate or a battery pack inside the device receives a magnetic field from the reader / writer. End up. For example, when considering the surface of the case of a mobile phone, the magnetic field coming from the reader / writer tends to be strong at the outer peripheral portion of the case surface and weak near the center of the case surface.
  • the loop coil In the case of an antenna using a normal loop coil, the loop coil is located at the central portion of the mobile phone where the opening portion cannot receive the magnetic field passing through the outer peripheral portion of the casing surface described above. For this reason, in the antenna using a normal loop coil, the efficiency which receives a magnetic field has deteriorated. Therefore, in an RFID antenna module built in an electronic device, a method for improving communication characteristics by using a metal plate such as a substrate, or an antenna device for increasing performance by increasing magnetic flux using a magnetic sheet has been proposed. (For example, refer to Patent Documents 1 to 4).
  • the present invention has been made in view of the above problems, and a new and improved antenna device capable of ensuring good communication performance even when an antenna coil is installed under the thermal diffusion sheet, and An object is to provide electronic equipment.
  • One aspect of the present invention is an antenna device that is incorporated in an electronic device and communicates with an external device via an electromagnetic field signal, and an antenna coil that is provided by winding a conductive wire in a ring shape and inductively coupled to the external device And a thermal diffusion sheet provided on the surface of the antenna coil facing the external device so as to overlap the antenna coil, and the thermal diffusion sheet has a region overlapping with the opening of the antenna coil.
  • a slit portion formed over an end portion of the thermal diffusion sheet, and a thermal diffusion sheet side opening portion or a thermal diffusion sheet side slit portion connected to the slit portion and formed in a region overlapping with the opening portion of the antenna coil Provided.
  • the thermal diffusion sheet side opening or the thermal diffusion sheet side slit in the region overlapping the opening of the antenna coil of the thermal diffusion sheet, the thermal diffusion sheet side opening or heat The magnetic flux passes through the diffusion sheet side slit portion. For this reason, even when the antenna coil is installed on the lower side of the thermal diffusion sheet, it is possible to ensure good communication performance of the NFC antenna.
  • the thermal diffusion sheet side slit portion connected to the slit portion may be formed along the inner shape of the opening of the antenna coil.
  • a metal sheet formed by penetrating at least part of the slit portion and the heat diffusion sheet side slit portion is further provided on one surface of the heat diffusion sheet. Also good.
  • the opening of the antenna coil has a rectangular shape, and the heat diffusion sheet side slit is formed along three sides of the inner shape of the opening. Also good.
  • the opening of the antenna coil has a rectangular shape, and the heat diffusion sheet side slit is formed along four sides of the inner shape of the opening. Also good.
  • the thermal diffusion sheet may be formed of graphite.
  • Another aspect of the present invention is an electronic device in which any of the antenna devices described above is incorporated and can communicate with an external device via an electromagnetic field signal.
  • FIG. 1 is a perspective view showing a schematic configuration of a wireless communication system to which an antenna device according to an embodiment of the present invention is applied.
  • 2A is a perspective view illustrating an example of a schematic configuration of an antenna device according to an embodiment of the present invention
  • FIG. 2B is a plan view illustrating an example of a schematic configuration of the antenna device according to an embodiment of the present invention.
  • FIG. 2C is a plan view showing a state where the heat diffusion sheet of the antenna device shown in FIG. 2B is removed.
  • FIG. 3A is a perspective view illustrating an example of a schematic configuration of an antenna device according to another embodiment of the present invention
  • FIG. 3B illustrates an example of a schematic configuration of the antenna device according to another embodiment of the present invention.
  • FIG. 4A is a perspective view illustrating an example of a schematic configuration of an antenna device according to another embodiment of the present invention
  • FIG. 4B illustrates an example of a schematic configuration of the antenna device according to another embodiment of the present invention
  • 4C is a cross-sectional view taken along the line AA of FIG. 4B
  • 5A and 5B are plan views showing an example of a schematic configuration of an antenna device according to another embodiment of the present invention
  • 6A to 6D are plan views showing an example of a schematic configuration of an antenna device according to another embodiment of the present invention.
  • 7A to 7C are explanatory diagrams of an evaluation method for confirming the operation / effect of the antenna device according to the embodiment of the present invention.
  • FIG. 8A is a perspective view illustrating an example of a schematic configuration of an antenna device as a comparative example
  • FIG. 8B is a plan view illustrating an example of a schematic configuration of an antenna device as a comparative example
  • FIG. 9A is a perspective view illustrating an example of a schematic configuration of an antenna apparatus as another comparative example
  • FIG. 9B is a plan view illustrating an example of a schematic configuration of an antenna apparatus as another comparative example.
  • FIG. 9B is a sectional view taken along line BB in FIG. 9B.
  • FIG. 10 is a graph showing a communication performance evaluation result for confirming the operation / effect of the antenna device according to the embodiment of the present invention.
  • FIG. 1 is a perspective view showing a schematic configuration of a wireless communication system to which an antenna device according to an embodiment of the present invention is applied
  • FIG. 2A is an example of a schematic configuration of the antenna device according to an embodiment of the present invention
  • 2B is a plan view showing an example of a schematic configuration of the antenna device according to the embodiment of the present invention
  • FIG. 2C is a diagram excluding the heat diffusion sheet of the antenna device shown in FIG. 2B. It is a top view which shows a state.
  • the antenna device 1 is a device that is incorporated in an electronic device 30 and communicates with an external device via an electromagnetic field signal.
  • the antenna device 1 is incorporated in an RFID wireless communication system 100 as shown in FIG. Used.
  • the wireless communication system 100 includes an antenna device 1 provided in an electronic device 30 and a reader / writer 40 serving as an external device that accesses the antenna device 1.
  • the antenna device 1 and the reader / writer 40 are arranged to face each other on the XY plane of the three-dimensional orthogonal coordinate system XYZ shown in FIG.
  • the reader / writer 40 functions as a transmitter that transmits a magnetic field in the Z-axis direction to the antenna devices 1 that face each other in the XY plane, and specifically, an antenna 41 that transmits a magnetic field toward the antenna device 1 And a control board 42 that communicates with the antenna device 1 that is inductively coupled via the antenna 41.
  • the reader / writer 40 is provided with a control board 42 electrically connected to the antenna 41.
  • a control circuit 43 made of electronic components such as one or a plurality of integrated circuit chips is mounted on the control board 42.
  • the control circuit 43 executes various processes based on the data received from the antenna device 1.
  • the control circuit 43 when transmitting data to the antenna device 1, the control circuit 43 encodes the data, modulates a carrier wave of a predetermined frequency (for example, 13.56 MHz) based on the encoded data, and modulates the data.
  • the modulated signal is amplified, and the antenna 41 is driven by the amplified modulated signal.
  • the control circuit 43 when reading data from the antenna device 1, the control circuit 43 amplifies the modulation signal of the data received by the antenna 41, demodulates the modulation signal of the amplified data, and decodes the demodulated data.
  • the control circuit 43 uses an encoding method and a modulation method used in a general reader / writer. For example, a Manchester encoding method or an ASK (Amplitude Shift Keying) modulation method is used.
  • a Manchester encoding method or an ASK (Amplitude Shift Keying) modulation method is used.
  • ASK Amplitude Shift Keying
  • the antenna device 1 is incorporated into a housing 32 of an electronic device 30 such as a mobile phone that is disposed so as to face the reader / writer 40 in the XY plane.
  • the antenna device 1 is driven by the antenna module 2 having the antenna substrate 3 on which the antenna coil 12 capable of communicating with the reader / writer 40 that is inductively coupled is mounted, and the current flowing through the antenna coil 12.
  • a communication processing unit 13 that performs communication with the reader / writer 40.
  • the antenna device 1 is provided inside the housing (conductor) of the electronic device 30 and communicates with the reader / writer 40 that is inductively coupled.
  • the antenna device 1 is used in a portable terminal or the like having an antenna coil 12, a battery pack 15, a printed circuit board 16, and a SIM slot 17.
  • a terminal portion 14 to be connected is mounted.
  • the antenna coil 12 When the antenna coil 12 receives a magnetic field transmitted from the reader / writer 40, the antenna coil 12 is magnetically coupled to the reader / writer 40 by inductive coupling, receives the modulated electromagnetic wave, and performs communication processing of the received signal via the terminal unit 14. It has a function of supplying to the unit 13. As shown in FIG. 2A, the antenna coil 12 has a substantially rectangular shape. One conductor 12a of the antenna coil 12 is circulated along the outer shape, and the center side thereof is an opening 12b. The antenna coil 12 is arranged so that the main surface around which the conducting wire 12a circulates opposes the reader / writer 40 in the XY plane shown in FIG. 1 during communication.
  • the communication processing unit 13 is driven by the current flowing through the antenna coil 12 and communicates with the reader / writer 40. Specifically, the communication processing unit 13 demodulates the received modulation signal, decodes the demodulated data, and writes the decoded data in the internal memory of the communication processing unit 13. The communication processing unit 13 reads the data to be transmitted to the reader / writer 40 from the internal memory, encodes the read data, modulates the carrier wave based on the encoded data, and is magnetically coupled by inductive coupling. The radio wave modulated through the coil 12 is transmitted to the reader / writer 40. Note that the communication processing unit 13 may be driven not by power flowing through the antenna coil 12 but by power supplied from a power supply unit such as a battery pack or an external power source incorporated in the electronic device.
  • a power supply unit such as a battery pack or an external power source incorporated in the electronic device.
  • the thermal diffusion sheet 20 is connected to the external device 40 in order to diffuse the heat inside the electronic device 30 to the housing 32 in a portion facing the electronic component such as the printed circuit board 16 that generates heat when the electronic device 30 is driven. It is provided inside the housing 32 of the electronic device 30 so as to face each other. Specifically, as shown in FIGS. 2A and 2B, the heat diffusion sheet 20 is an electronic component (a heat source) that overlaps the antenna coil 12 on the surface of the antenna coil 12 facing the external device 40. (Printed circuit board) 16 is provided at a portion facing.
  • a graphite sheet, a carbon fiber sheet, a shield material obtained by etching a metal foil made of copper or the like into a mesh shape, or the like is used. It is preferable to use a graphite sheet as the thermal diffusion sheet 20 from the viewpoint of excellent functions such as thermal diffusibility, flame retardancy, heat resistance, and ignition prevention.
  • the battery pack 15 is provided in a housing 32 of the electronic device 30 (see FIG. 1), and is opposed to a reader / writer 40 (see FIG. 1) serving as an external device. It becomes a conductor. That is, the battery pack 15 constitutes a first conductor that faces the reader / writer 40 during communication of the antenna module 2.
  • the battery pack 15 flows electricity relatively well, when an AC magnetic field is applied from the outside, an eddy current is generated and the magnetic field is rebounded. Examining the magnetic field distribution when an AC magnetic field is applied from the outside, the magnetic field on the end side of the battery pack 15 serving as the first conductor facing the reader / writer 40 is strong. Therefore, conventionally, in order to ensure good communication characteristics with the reader / writer 40 while reducing the size of the electronic device 30 when it is incorporated in the electronic device 30 such as a mobile phone, The antenna coil 12 has been provided on the outer edge side of the battery pack 15 provided in the housing 32 of the mobile phone 30.
  • the thermal diffusion sheet 20 such as graphite is provided for the purpose of dispersing the local heat generation where the electronic components are provided.
  • the antenna coil 12 is installed under the heat diffusion sheet 20 such as a graphite sheet made of semiconductor, the magnetic flux from the external device 40 is blocked by the heat diffusion sheet 20, so that the battery serving as the first conductor is used. Even if the antenna coil 12 is installed on the outer edge side of the pack 15, sufficient communication performance as an antenna may not be ensured. That is, there is a concern that the antenna communication characteristics using the magnetic shielding effect by the battery pack 15 cannot be sufficiently improved by installing the antenna coil 12 below the thermal diffusion sheet 20.
  • the antenna device 1 is provided with a slit 18 and a heat diffusion sheet side opening 19 in the heat diffusion sheet 20 as shown in FIGS. 2A and 2B. It is characterized by being able to.
  • the slit portion 18 is a slit having a large length direction with respect to the width direction, and is formed from a region overlapping with the opening portion 12b of the antenna coil 12 to the end portion 20a of the thermal diffusion sheet 20.
  • the slit portion 18 By providing the slit portion 18, the loop of eddy current flowing through the thermal diffusion sheet 20 at the time of communication is interrupted, so that eddy current can be prevented and loss of magnetic flux passing therethrough can be suppressed.
  • the width of the slit portion 18 is not particularly limited because it is only necessary to prevent the generation of eddy currents in the thermal diffusion sheet 20.
  • the heat diffusion sheet side opening 19 is connected to the slit 18 and is formed in a region overlapping with the opening 12 b of the antenna coil 12.
  • FIG. 3A is a perspective view illustrating an example of a schematic configuration of an antenna device according to another embodiment of the present invention
  • FIG. 3B illustrates an example of a schematic configuration of the antenna device according to another embodiment of the present invention.
  • the antenna device 101 is provided with a slit portion 118 and a thermal diffusion sheet side slit portion 119 in the thermal diffusion sheet 120 as shown in FIGS. 3A and 3B. It is characterized by that.
  • the slit portion 118 is a slit having a large length direction relative to the width direction, and is formed from a region overlapping with the opening portion 112b of the antenna coil 112 to the end portion 120a of the thermal diffusion sheet 120.
  • the slit portion 118 By providing the slit portion 118, the loop of eddy current flowing through the thermal diffusion sheet 120 during communication is interrupted, so that eddy current can be prevented from being generated and loss of the passing magnetic flux can be suppressed.
  • the width of the slit portion 118 is not particularly limited because it is only necessary to prevent generation of eddy currents in the thermal diffusion sheet 120.
  • the antenna device 101 of the present embodiment is different from the antenna device 1 of the first embodiment in the shape of the gap portion connected to the slit portion 118 formed in the heat diffusion sheet 120. That is, in this embodiment, as shown in FIGS. 3A and 3B, the gap portion connected to the slit portion 118 formed in the thermal diffusion sheet 120 is a slit having a large length direction with respect to the width direction. A heat diffusion sheet side slit 119 formed along the inner shape of the opening 112b of the antenna coil 112 is provided.
  • the heat diffusion sheet side slit portion 119 branches off from the connection portion with the slit portion 118 and is formed along three sides of the inner shape of the opening 112b of the rectangular antenna coil 112.
  • the inner shape refers to a boundary portion between the antenna coil 112 and the opening 112b of the antenna coil 112.
  • the width of the thermal diffusion sheet side slit portion 119 is not particularly limited as long as it can communicate with the external device 40.
  • the magnetic flux transmitted from the external device 40 passes through the heat diffusion sheet side slit portion 119.
  • gap part connected with the slit part 118 formed in the thermal diffusion sheet 120 becomes small compared with 1st Embodiment, it can suppress the reduction
  • FIG. 4A is a perspective view illustrating an example of a schematic configuration of an antenna device according to another embodiment of the present invention
  • FIG. 4B illustrates an example of a schematic configuration of the antenna device according to another embodiment of the present invention
  • 4C is a cross-sectional view taken along the line AA of FIG. 4B.
  • the antenna device 201 is provided with a slit portion 218 and a thermal diffusion sheet side slit portion 219 in the thermal diffusion sheet 220 as shown in FIGS. 4A and 4B.
  • one surface of the heat diffusion sheet 220 is further provided with a metal sheet 222 formed by penetrating at least a part of the slit portion 218 and the heat diffusion sheet side slit portion 219.
  • a metal sheet 222 is formed between the antenna coil 212 and the heat diffusion sheet 220 so that the slit portion 218 and the heat diffusion sheet side slit portion 219 are formed therethrough.
  • the slit portion 218 is a narrow slit whose length direction is larger than the width direction, and is formed from a region overlapping with the opening portion 212b of the antenna coil 212 to the end portion 220a of the thermal diffusion sheet 220.
  • the slit portion 218 By providing the slit portion 218, the loop of eddy current flowing through the thermal diffusion sheet 220 during communication is interrupted, so that eddy current is prevented from being generated and loss of magnetic flux passing therethrough can be suppressed.
  • the width of the slit portion 218 is not particularly limited because it is only necessary to prevent generation of eddy currents in the thermal diffusion sheet 220.
  • the slit portion 218 and the heat diffusion sheet side slit portion 219 penetrate between the antenna coil 212 and the heat diffusion sheet 220 with respect to the antenna device 101 of the second embodiment.
  • a metal sheet 222 made of aluminum or the like to be formed is further provided.
  • the antenna coil 212 is used as a gap portion connected to the slit portion 218 formed in the thermal diffusion sheet 220.
  • a thermal diffusion sheet side slit 219 which is a slit formed along the inner shape of the opening 212b.
  • the heat diffusion sheet side slit part 219 branches off from the connection part with the slit part 218, and is formed along the three sides of the inner shape of the opening 212b of the rectangular antenna coil 212.
  • the inner shape refers to a boundary portion between the antenna coil 212 and the opening 212b of the antenna coil 212.
  • the thermal diffusion sheet 220 is formed of graphite, which is a semiconductor, an eddy current generated by the application of alternating magnetic flux from the external device 40 does not flow smoothly, so that it is lost as heat and the Q value of the antenna coil 212 is increased. May decrease.
  • the antenna sheet 212 and the heat diffusion sheet 220 are further provided with a metal sheet 222 formed by penetrating the slit portion 218 and the heat diffusion sheet side slit portion 219, thereby providing an antenna.
  • the thermal diffusion sheet 220 has a larger slit width of the slit portion 218 and the thermal diffusion sheet side slit portion 219 than the metal sheet 222. Is preferred.
  • a metal sheet 222 formed by penetrating the slit portion 218 and the heat diffusion sheet side slit portion 219 is further provided between the antenna coil 212 and the heat diffusion sheet 220.
  • the metal sheet 222 in the present embodiment has a function of suppressing a decrease in the Q value of the antenna coil 212. For this reason, you may provide the slit part 218 and the thermal diffusion sheet side slit part 219 in the metal housing
  • casing 232 which has the surface opposite to the surface facing the antenna coil 212 of the thermal diffusion sheet 220.
  • the magnetic flux transmitted from the external device 40 passes through the heat diffusion sheet side slit portion 219.
  • gap part connected with the slit part 218 formed in the thermal diffusion sheet 220 becomes small compared with 1st Embodiment, it can suppress the reduction
  • the gaps connected to the slits 118 and 218 formed in the heat diffusion sheets 120 and 220 according to another embodiment described above.
  • the formation mode of the thermal diffusion sheet side slit portions 119 and 219 formed in this manner is not limited to the above-described mode. Modification examples of the heat diffusion sheet side slit portions 119 and 219 will be described below with reference to the drawings.
  • FIGS. 6A to 6D are plan views showing an example of a schematic configuration of an antenna device according to another embodiment of the present invention.
  • the thermal diffusion sheet side slit portion 319 connected to the slit portion 318 formed from the end portion 320a of the thermal diffusion sheet 320 is The inner shape of the opening 312b of the rectangular antenna coil 312 is formed along four sides. That is, the thermal diffusion sheet side slit 319 is formed along each side of the opening 312b of the rectangular antenna coil 312 as shown in FIG. 5A. At this time, if slits are provided on the four sides, the portion of the heat diffusion sheet 320 that overlaps the opening 312b of the antenna coil 312 may be separated, so one of the four sides (FIG. 5A).
  • a slit-free region 319a is defined in a slit along a side facing the connecting portion with the slit portion 318 formed from the region overlapping the opening 312b of the antenna coil 312 to the end portion 320a of the thermal diffusion sheet 320. Keep it.
  • the thermal diffusion sheet 321 is coated with a resin or the like as in the antenna device 302 shown in FIG. 5B, there is no possibility that the thermal diffusion sheet 321 inside the antenna coil 312 is separated.
  • slits may be formed on all four sides of the antenna coil 312.
  • the heat diffusion sheet side slit portion 319b connected to the slit portion 318 formed from the end portion 321a of the heat diffusion sheet 321 is formed along the inner shape of the opening 312a of the substantially rectangular antenna coil 312.
  • magnetic flux passes through the thermal diffusion sheet side slit portion 319b, so that even when the antenna coil 312 is installed under the thermal diffusion sheet 321, good communication performance of the NFC antenna is ensured. Can do.
  • the diffusion sheet side slit portion 419 connected to the slit portion 418 formed from the end portion 420 a of the heat diffusion sheet 420 is along the inner shape on the upper side of the antenna coil 412. It is formed.
  • the thermal diffusion sheet side slit portion 519 connected to the slit portion 518 formed from the end portion 520a of the thermal diffusion sheet 520 has an intermediate region of the opening portion 512b of the antenna coil 512. It is formed to cut vertically.
  • the heat diffusion sheet side slit portion 619 connected to the slit portion 618 formed from the end portion 620 a of the heat diffusion sheet 620 follows the inner shape of the lower side of the antenna coil 612. Formed.
  • the thermal diffusion sheet side slit portion 719 connected to the slit portion 718 formed from the end portion 720 a of the thermal diffusion sheet 720 is an intermediate region of the opening 712 b of the antenna coil 712. It is formed in a cross shape that cuts in the vertical and horizontal directions.
  • the magnetic flux passes through the slit portion on the thermal diffusion sheet side. That is, the thermal diffusion sheet side slit portions 419, 519, 619, and 719 connected to the slit portions 418, 518, 618, and 718 are substantially rectangular openings 412b, 512b, and 612b of the antenna coils 412, 512, 612, and 712.
  • the antenna coils 412, 512, 612, 712 are installed below the heat diffusion sheets 420, 520, 620, 720, good NFC antenna communication performance can be ensured. Further, since the position where the magnetic flux passes differs depending on the formation position of the diffusion sheet side slit portions 419, 519, 619, 719, for example, depending on the communication position with the external device 40, the diffusion sheet side slit portions 419, 519, The formation positions of 619 and 719 can be adjusted.
  • the shape of the antenna coil is rectangular.
  • the shape of the antenna coil is not limited to a rectangular shape, for example, a polygon such as a hexagon, an octagon, Even an antenna coil having a curved shape such as a circle or an ellipse is applicable. That is, any antenna coil that is provided by winding a conducting wire in a two-dimensional manner functions as an antenna coil that is inductively coupled to an external device, and thus can be applied to the antenna device according to each embodiment of the present invention.
  • the antenna device in each embodiment of the present invention by providing either the thermal diffusion sheet side opening or the thermal diffusion sheet side slit in the region overlapping the opening of the antenna coil of the thermal diffusion sheet, Magnetic flux comes to pass through the thermal diffusion sheet side opening or the thermal diffusion sheet side slit. For this reason, even when the antenna coil is installed on the lower side of the thermal diffusion sheet, it is possible to ensure good communication performance of the NFC antenna.
  • the antenna device can be designed with good antenna communication characteristics while improving the degree of freedom in designing the antenna device. become able to.
  • FIG. 7A to 7C are explanatory diagrams of an evaluation method for confirming the operation and effect of the antenna device according to the embodiment of the present invention.
  • FIG. 7A is a comparison showing the antenna device 801 without a graphite sheet.
  • 7 is a perspective view of Example 1
  • FIG. 7B is a cross-sectional view of Comparative Example 1
  • FIG. 7C is a plan view of Comparative Example 1.
  • FIG. 8A is a perspective view illustrating an example of a schematic configuration of an antenna device 802 serving as a comparative example 2
  • FIG. 8B is a plan view illustrating an example of a schematic configuration of the antenna device 802 serving as a comparative example 2.
  • FIG. 9A is a perspective view illustrating an example of a schematic configuration of an antenna device 803 serving as a comparative example 3
  • FIG. 9B is a plan view illustrating an example of a schematic configuration of an antenna device 803 serving as a comparative example 3.
  • FIG. 9C is a cross-sectional view taken along the line BB in FIG. 9B.
  • a battery pack 815 of 70 mm ⁇ 64 mm ⁇ 4 mm and a printed circuit board 816 are formed on a 140 mm ⁇ 70 mm housing substrate 832.
  • a SIM slot 817 and a 40 mm ⁇ 30 mm ⁇ 0.3 mm antenna coil 812 are provided on the top of the antenna coil 812, and a graphite sheet is not provided on the upper side of the antenna coil 812.
  • a reader antenna 840 having a diameter of 70 mm and including two antenna coils 841 is placed immediately above the antenna coil 812 at a distance of 45 mm, and the position where the centers of the two antennas coincide with each other is set as the origin, and the reader antenna 840 is set in the X-axis direction.
  • the distribution of magnetic coupling coefficient was evaluated.
  • a SIM slot 817 and a 40 mm ⁇ 30 mm ⁇ 0.3 mm antenna coil 812 are provided on 816, and a 0.06 mm thick graphite sheet 820 having no opening is disposed on the upper side of the antenna coil 812.
  • the reader antenna 840 was moved in the X-axis direction to evaluate the magnetic coupling coefficient distribution.
  • a battery pack 815 of 70 mm ⁇ 64 mm ⁇ 4 mm and a printed circuit board are formed on a housing substrate 832 of 140 mm ⁇ 70 mm.
  • a SIM slot 817 and a 40 mm ⁇ 30 mm ⁇ 0.3 mm antenna coil 812 are provided on 816, and an opening 822 having a thickness of 0.06 mm and the same size as the outer shape of the antenna coil 812 is provided above the antenna coil 812. What formed the graphite sheet 821 was used.
  • the reader antenna 840 was moved in the X-axis direction to evaluate the magnetic coupling coefficient distribution.
  • the antenna device 1 according to the first embodiment of the present invention was used as Example 1, and the reader antenna 840 was moved in the X-axis direction in the same manner to evaluate the distribution of the magnetic coupling coefficient.
  • a battery pack 15 of 70 mm ⁇ 64 mm ⁇ 4 mm on a housing substrate 32 of 140 mm ⁇ 70 mm, a SIM slot 17 and 40 mm ⁇ 30 mm ⁇ 0.3 mm of a printed circuit board 16 are provided.
  • An antenna coil 12 is provided, and an opening 19 having a thickness of 0.06 mm is formed on the upper side of the antenna coil 12 and a 10 mm square is formed on the center side of the antenna opening 12b.
  • the graphite sheet 20 connected in the above was used.
  • the antenna device 101 according to the second embodiment of the present invention was used as Example 2, and the reader antenna 840 was moved in the X-axis direction in the same manner to evaluate the distribution of the magnetic coupling coefficient.
  • a battery pack 115 of 70 mm ⁇ 64 mm ⁇ 4 mm on a housing substrate 132 of 140 mm ⁇ 70 mm, a SIM slot 117 and 40 mm ⁇ 30 mm ⁇ 0.3 mm of the printed circuit board 116 are used.
  • An antenna coil 112 is provided, and a heat diffusion sheet side slit 119 having a thickness of 0.06 mm and a width of 0.5 mm is formed on the upper side of the antenna coil 112 along the inner shape of the opening 112b of the antenna coil 112.
  • the one in which the graphite sheet 120 connected to the end portion 120a by the slit portion 118 of 0.5 mm was disposed was used.
  • the antenna device 201 according to the third embodiment of the present invention was used as Example 3, and the reader antenna 840 was moved in the X-axis direction in the same manner to evaluate the distribution of the magnetic coupling coefficient.
  • a battery pack 215 of 70 mm ⁇ 64 mm ⁇ 4 mm on a case substrate 232 of 140 mm ⁇ 70 mm, a SIM slot 217, and 40 mm ⁇ 30 mm ⁇ 0.3 mm of a printed circuit board 216 are used.
  • An antenna coil 212 is provided, and a heat diffusion sheet side slit 219 having a thickness of 0.06 mm and a width of 0.5 mm is formed on the upper side of the antenna coil 212 along the inner shape of the opening 212b of the antenna coil 212.
  • the graphite sheet 220 connected by a slit portion 218 of 0.5 mm up to 220a is arranged, and the lower side of the graphite sheet 220 (NFC antenna side) is made of an aluminum foil of the same size and has the same slit as the graphite sheet 220.
  • FIG. 10 is a graph showing a communication performance evaluation result for confirming the operation / effect of the antenna device according to the embodiment of the present invention.
  • Comparative Example 1 as a Benchmark, the coupling coefficient k changes between 0.010 and 0.014.
  • Comparative Example 2 since the entire surface of the antenna coil 812 is covered with the graphite sheet 820, most of the magnetic flux from the reader antenna 840 is blocked, so that the coupling coefficient k is 0.002 to 0.00. It is greatly reduced so as to change between 003.
  • Comparative Example 3 although the opening portion 822 is formed in the graphite sheet 821, the slit portion connected to the end portion of the graphite sheet 821 is not formed, so that the coupling coefficient k is 0.008 to 0.011. The communication characteristics are worse than those of Comparative Example 1.
  • Example 1 the coupling coefficient k changes between 0.011 and 0.016, which is a better value than Comparative Example 1 as Benchmark. Therefore, the slit 18 and the heat diffusion sheet side opening 19 are provided in the graphite sheet 20 to prevent the generation of eddy current in the heat diffusion sheet 20, and the magnetic flux from the reader antenna 840 is transferred to the opening of the antenna coil 12. Since the part 12b is allowed to pass, it can be seen that the communication characteristics can be improved.
  • Example 2 as in Example 1, the coupling coefficient k changes between 0.011 and 0.016, which is a better value than Comparative Example 1 as Benchmark. Therefore, by providing the slit portion 118 and the thermal diffusion sheet side slit portion 119 in the graphite sheet 120, the generation of eddy current in the thermal diffusion sheet 120 is prevented, and the magnetic flux from the reader antenna 840 is applied to the antenna coil 112. Since the opening 112b can be passed, it can be seen that the communication characteristics can be improved as in the first embodiment.
  • Example 3 the coupling coefficient k changes between 0.017 and 0.022, which is a better value than Example 1 and Example 2. From this, by attaching the slit part 218 and the thermal diffusion sheet side slit part 219 to the graphite sheet 220, and pasting the metal sheet 222 having the same size and the same slit on the lower side of the graphite sheet 220, It can be seen that the communication characteristics are greatly improved. Therefore, while preventing the generation of eddy currents in the thermal diffusion sheet 220, the magnetic flux from the reader antenna 840 is allowed to pass through the opening 212b of the antenna coil 212, and the decrease in the Q value of the antenna coil 212 is suppressed. Thus, it can be seen that the communication characteristics are greatly improved.

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Abstract

In order to secure excellent communication performance even when an antenna coil is arranged on the underside of a thermal diffusion sheet, this antenna device (1), which is integrated into an electronic device and which communicates with an external device through electromagnetic field signals, is provided with: an antenna coil (12) which comprises a two-dimensionally wound conducting wire (12a) and which is inductively coupled with the external device, and a thermal diffusion sheet (20) which is provided on the surface of the antenna coil opposite to the external device so as to overlap the antenna coil. A slit (18), which is formed from a region overlapping the opening of the antenna coil to the end of the thermal diffusion sheet, and a thermal diffusion sheet-side opening (19) or a thermal diffusion sheet-side slit, which is connected to said slit and which is formed in a region overlapping the opening of the antenna coil, are formed in the thermal diffusion sheet.

Description

アンテナ装置、及び電子機器ANTENNA DEVICE AND ELECTRONIC DEVICE
　本発明は、電子機器に組み込まれ、発信器等の外部機器と電磁界信号を介して通信するアンテナ装置、及びこのアンテナ装置が組み込まれた電子機器に関する。本出願は、日本国において２０１５年７月２２日に出願された日本特許出願番号特願２０１５－１４４７０１を基礎として優先権を主張するものであり、これらの出願を参照することにより、本出願に援用される。 The present invention relates to an antenna device that is incorporated in an electronic device and communicates with an external device such as a transmitter via an electromagnetic field signal, and an electronic device in which the antenna device is incorporated. This application claims priority on the basis of Japanese Patent Application No. 2015-144701 filed on July 22, 2015 in Japan. By referring to these applications, the present application Incorporated.
　携帯電話機等の電子機器において、近距離非接触通信の機能を搭載するため、ＲＦＩＤ（Radio Frequency Identification）用のアンテナモジュールが用いられている。このアンテナモジュールは、リーダライタ等の発信器に搭載されたアンテナコイルと誘導結合を利用して通信を行っている。すなわち、このアンテナモジュールは、リーダライタからの磁界をアンテナコイルが受けることによって、それを電力に変換して通信処理部として機能するＩＣを駆動させることができる。 In an electronic device such as a mobile phone, an antenna module for RFID (Radio Frequency Identification) is used in order to incorporate a short-range non-contact communication function. This antenna module performs communication using an inductive coupling with an antenna coil mounted on a transmitter such as a reader / writer. That is, in this antenna module, when the antenna coil receives the magnetic field from the reader / writer, the antenna coil can convert it into electric power and drive an IC that functions as a communication processing unit.
　アンテナモジュールは、確実に通信を行うため、リーダライタからのある値以上の磁束をアンテナコイルで受ける必要がある。そのために、従来例に係るアンテナモジュールでは、携帯電話機の筐体にループコイルを設け、このコイルでリーダライタからの磁束を受けている。携帯電話機等の電子機器に組み込まれたアンテナモジュールは、機器内部の基板やバッテリパック等の金属がリーダライタからの磁界を受けることによって発生する渦電流のために、リーダライタからの磁束が跳ね返されてしまう。例えば、携帯電話機の筐体表面で考えると、リーダライタから来る磁界は、筐体表面の外周部分が強くなり、筐体表面の中央付近が弱くなる傾向にある。 The antenna module needs to receive a magnetic flux of a certain value or more from the reader / writer with the antenna coil in order to reliably communicate. Therefore, in the antenna module according to the conventional example, a loop coil is provided in the casing of the mobile phone, and the coil receives the magnetic flux from the reader / writer. The antenna module incorporated in an electronic device such as a cellular phone has a magnetic flux from the reader / writer rebounded due to an eddy current generated when a metal such as a substrate or a battery pack inside the device receives a magnetic field from the reader / writer. End up. For example, when considering the surface of the case of a mobile phone, the magnetic field coming from the reader / writer tends to be strong at the outer peripheral portion of the case surface and weak near the center of the case surface.
　通常のループコイルを用いるアンテナの場合では、ループコイルは、その開口部が上述した筐体表面の外周部分を通過する磁界をあまり受けられない携帯電話機の中央部分に位置している。このため、通常のループコイルを用いるアンテナでは、磁界を受ける効率が悪くなっている。そこで、電子機器に内蔵するＲＦＩＤアンテナモジュールにおいて、基板等の金属板を利用して通信特性を高める方法や、磁性シートを用いて磁束を増やして性能を高めるようにしたアンテナ装置が提案されている（例えば、特許文献１乃至４参照）。 In the case of an antenna using a normal loop coil, the loop coil is located at the central portion of the mobile phone where the opening portion cannot receive the magnetic field passing through the outer peripheral portion of the casing surface described above. For this reason, in the antenna using a normal loop coil, the efficiency which receives a magnetic field has deteriorated. Therefore, in an RFID antenna module built in an electronic device, a method for improving communication characteristics by using a metal plate such as a substrate, or an antenna device for increasing performance by increasing magnetic flux using a magnetic sheet has been proposed. (For example, refer to Patent Documents 1 to 4).
特開２０１０－２４５７７６号公報JP 2010-245776 A 特開２０１０－２５２４０２号公報JP 2010-252402 A 特開２０１１－２２９１３３号公報JP 2011-229133 A 特開２０１２－２１７１３３号公報JP 2012-217133 A
　いわゆるスマートフォン等の電子機器では、局所的な発熱を分散させてユーザの体感温度を下げる工夫がされ、外装カバーの内面に熱拡散シートとしてグラファイトシートを貼ることが多くなった。スマートフォン等の携帯機器に近距離無線通信用のＮＦＣ（ Near Field Communication ）アンテナを内蔵する場合に、グラファイトシートの下にＮＦＣアンテナを設けると、半導体であるグラファイトシートによって磁界が遮蔽されて、アンテナの通信性能が阻害される問題があった。 So-called smart phones and other electronic devices have been devised to disperse local heat generation and lower the user's perceived temperature, and a graphite sheet is often affixed to the inner surface of the exterior cover as a heat diffusion sheet. When an NFC (Near 無線 Field Communication) antenna for short-range wireless communication is built in a portable device such as a smartphone, if an NFC antenna is provided under the graphite sheet, the magnetic field is shielded by the graphite sheet, which is a semiconductor, There was a problem that communication performance was hindered.
　本発明は、上記課題に鑑みてなされたものであり、アンテナコイルを熱拡散シートの下側に設置した場合でも良好な通信性能を確保することの可能な、新規かつ改良されたアンテナ装置、及び電子機器を提供することを目的とする。 The present invention has been made in view of the above problems, and a new and improved antenna device capable of ensuring good communication performance even when an antenna coil is installed under the thermal diffusion sheet, and An object is to provide electronic equipment.
　本発明の一態様は、電子機器に組み込まれ、外部機器と電磁界信号を介して通信するアンテナ装置であって、導線が環状に巻回して設けられ、前記外部機器と誘導結合されるアンテナコイルと、前記アンテナコイルの前記外部機器との対向面に該アンテナコイルと重畳するように設けられる熱拡散シートと、を備え、前記熱拡散シートには、前記アンテナコイルの開口部と重畳する領域から該熱拡散シートの端部にかけて形成されるスリット部と、該スリット部と接続され、前記アンテナコイルの開口部と重畳する領域に形成される熱拡散シート側開口部又は熱拡散シート側スリット部が設けられる。 One aspect of the present invention is an antenna device that is incorporated in an electronic device and communicates with an external device via an electromagnetic field signal, and an antenna coil that is provided by winding a conductive wire in a ring shape and inductively coupled to the external device And a thermal diffusion sheet provided on the surface of the antenna coil facing the external device so as to overlap the antenna coil, and the thermal diffusion sheet has a region overlapping with the opening of the antenna coil. A slit portion formed over an end portion of the thermal diffusion sheet, and a thermal diffusion sheet side opening portion or a thermal diffusion sheet side slit portion connected to the slit portion and formed in a region overlapping with the opening portion of the antenna coil Provided.
　本発明の一態様によれば、熱拡散シートのアンテナコイルの開口部と重畳する領域に熱拡散シート側開口部又は熱拡散シート側スリット部を設けることによって、当該熱拡散シート側開口部又は熱拡散シート側スリット部内を磁束が通過するようになる。このため、アンテナコイルを熱拡散シートの下側に設置した場合でも、良好なＮＦＣアンテナの通信性能を確保することができる。 According to one aspect of the present invention, by providing the thermal diffusion sheet side opening or the thermal diffusion sheet side slit in the region overlapping the opening of the antenna coil of the thermal diffusion sheet, the thermal diffusion sheet side opening or heat The magnetic flux passes through the diffusion sheet side slit portion. For this reason, even when the antenna coil is installed on the lower side of the thermal diffusion sheet, it is possible to ensure good communication performance of the NFC antenna.
　このとき、本発明の一態様では、前記スリット部と接続される前記熱拡散シート側スリット部は、前記アンテナコイルの前記開口部の内形に沿って形成されることとしてもよい。 At this time, in one aspect of the present invention, the thermal diffusion sheet side slit portion connected to the slit portion may be formed along the inner shape of the opening of the antenna coil.
　このようにすれば、熱拡散シート側スリット部内を磁束が通過するようになるので、アンテナコイルを熱拡散シートの下側に設置した場合でも、良好なＮＦＣアンテナの通信性能を確保することができる。 In this way, since the magnetic flux passes through the slit portion on the heat diffusion sheet side, it is possible to ensure good communication performance of the NFC antenna even when the antenna coil is installed below the heat diffusion sheet. .
　また、本発明の一態様では、前記熱拡散シートの一方の面には、前記スリット部及び前記熱拡散シート側スリット部の少なくとも一部が貫通して形成される金属シートが更に設けられることとしてもよい。 Moreover, in one aspect of the present invention, a metal sheet formed by penetrating at least part of the slit portion and the heat diffusion sheet side slit portion is further provided on one surface of the heat diffusion sheet. Also good.
　このようにすれば、アンテナコイルのＱ値の低下が抑制されるので、アンテナコイルを熱拡散シートの下側に設置した場合でも、良好なＮＦＣアンテナの通信性能を確保することができる。 In this way, since the reduction of the Q value of the antenna coil is suppressed, it is possible to ensure good NFC antenna communication performance even when the antenna coil is installed on the lower side of the thermal diffusion sheet.
　また、本発明の一態様では、前記アンテナコイルの前記開口部は、矩形状であり、前記熱拡散シート側スリット部は、該開口部の内形のうち３辺に沿って形成されることとしてもよい。 In one aspect of the present invention, the opening of the antenna coil has a rectangular shape, and the heat diffusion sheet side slit is formed along three sides of the inner shape of the opening. Also good.
　このようにすれば、熱拡散シート側スリット部内を磁束が通過するようになるので、アンテナコイルを熱拡散シートの下側に設置した場合でも、良好なＮＦＣアンテナの通信性能を確保することができる。 In this way, since the magnetic flux passes through the slit portion on the heat diffusion sheet side, it is possible to ensure good communication performance of the NFC antenna even when the antenna coil is installed below the heat diffusion sheet. .
　また、本発明の一態様では、前記アンテナコイルの前記開口部は、矩形状であり、前記熱拡散シート側スリット部は、該開口部の内形のうち４辺に沿って形成されることとしてもよい。 Moreover, in one aspect of the present invention, the opening of the antenna coil has a rectangular shape, and the heat diffusion sheet side slit is formed along four sides of the inner shape of the opening. Also good.
　このようにすれば、熱拡散シート側スリット部内を磁束が通過するようになるので、アンテナコイルを熱拡散シートの下側に設置した場合でも、良好なＮＦＣアンテナの通信性能を確保することができる。 In this way, since the magnetic flux passes through the slit portion on the heat diffusion sheet side, it is possible to ensure good communication performance of the NFC antenna even when the antenna coil is installed below the heat diffusion sheet. .
　また、本発明の一態様では、前記熱拡散シートは、グラファイトから形成されることとしてもよい。 In one embodiment of the present invention, the thermal diffusion sheet may be formed of graphite.
　このようにすれば、グラファイトに形成される熱拡散シート側スリット部内を磁束が通過するようになるので、アンテナコイルを熱拡散シートの下側に設置した場合でも、良好なＮＦＣアンテナの通信性能を確保することができる。 In this way, since the magnetic flux passes through the slit portion on the heat diffusion sheet formed in the graphite, even when the antenna coil is installed on the lower side of the heat diffusion sheet, good communication performance of the NFC antenna can be obtained. Can be secured.
　また、本発明の他の態様は、前述した何れかのアンテナ装置が組み込まれ、外部機器と電磁界信号を介して通信可能な電子機器である。 Another aspect of the present invention is an electronic device in which any of the antenna devices described above is incorporated and can communicate with an external device via an electromagnetic field signal.
　本発明の他の態様によれば、アンテナ装置の設計自由度の向上を図りつつ、外部機器に対する電子機器の良好なアンテナ通信特性を確保することができる。 According to another aspect of the present invention, it is possible to ensure good antenna communication characteristics of an electronic device with respect to an external device while improving the degree of design freedom of the antenna device.
　以上説明したように本発明によれば、アンテナコイルを熱拡散シートの下側に設置した場合でも、良好なＮＦＣアンテナの通信性能を確保できる。 As described above, according to the present invention, good NFC antenna communication performance can be ensured even when the antenna coil is installed below the thermal diffusion sheet.
図１は、本発明の一実施形態に係るアンテナ装置が適用される無線通信システムの概略構成を示す斜視図である。FIG. 1 is a perspective view showing a schematic configuration of a wireless communication system to which an antenna device according to an embodiment of the present invention is applied. 図２Ａは、本発明の一実施形態に係るアンテナ装置の概略構成の一例を示す斜視図であり、図２Ｂは、本発明の一実施形態に係るアンテナ装置の概略構成の一例を示す平面図であり、図２Ｃは、図２Ｂに示すアンテナ装置の熱拡散シートを除いた状態を示す平面図である。2A is a perspective view illustrating an example of a schematic configuration of an antenna device according to an embodiment of the present invention, and FIG. 2B is a plan view illustrating an example of a schematic configuration of the antenna device according to an embodiment of the present invention. FIG. 2C is a plan view showing a state where the heat diffusion sheet of the antenna device shown in FIG. 2B is removed. 図３Ａは、本発明の他の一実施形態に係るアンテナ装置の概略構成の一例を示す斜視図であり、図３Ｂは、本発明の他の一実施形態に係るアンテナ装置の概略構成の一例を示す平面図である。FIG. 3A is a perspective view illustrating an example of a schematic configuration of an antenna device according to another embodiment of the present invention, and FIG. 3B illustrates an example of a schematic configuration of the antenna device according to another embodiment of the present invention. FIG. 図４Ａは、本発明の他の一実施形態に係るアンテナ装置の概略構成の一例を示す斜視図であり、図４Ｂは、本発明の他の一実施形態に係るアンテナ装置の概略構成の一例を示す平面図であり、図４Ｃは、図４ＢのＡ－Ａ断面図である。FIG. 4A is a perspective view illustrating an example of a schematic configuration of an antenna device according to another embodiment of the present invention, and FIG. 4B illustrates an example of a schematic configuration of the antenna device according to another embodiment of the present invention. 4C is a cross-sectional view taken along the line AA of FIG. 4B. 図５Ａ及び図５Ｂは、本発明の他の一実施形態に係るアンテナ装置の概略構成の一例を示す平面図である。5A and 5B are plan views showing an example of a schematic configuration of an antenna device according to another embodiment of the present invention. 図６Ａ乃至図６Ｄは、本発明の他の一実施形態に係るアンテナ装置の概略構成の一例を示す平面図である。6A to 6D are plan views showing an example of a schematic configuration of an antenna device according to another embodiment of the present invention. 図７Ａ乃至図７Ｃは、本発明の一実施形態に係るアンテナ装置の作用・効果を確認するための評価方法の説明図である。7A to 7C are explanatory diagrams of an evaluation method for confirming the operation / effect of the antenna device according to the embodiment of the present invention. 図８Ａは、比較例となるアンテナ装置の概略構成の一例を示す斜視図であり、図８Ｂは、比較例となるアンテナ装置の概略構成の一例を示す平面図である。FIG. 8A is a perspective view illustrating an example of a schematic configuration of an antenna device as a comparative example, and FIG. 8B is a plan view illustrating an example of a schematic configuration of an antenna device as a comparative example. 図９Ａは、他の比較例となるアンテナ装置の概略構成の一例を示す斜視図であり、図９Ｂは、他の比較例となるアンテナ装置の概略構成の一例を示す平面図であり、図９Ｃは、図９ＢのＢ－Ｂ断面図である。FIG. 9A is a perspective view illustrating an example of a schematic configuration of an antenna apparatus as another comparative example, and FIG. 9B is a plan view illustrating an example of a schematic configuration of an antenna apparatus as another comparative example. FIG. 9B is a sectional view taken along line BB in FIG. 9B. 図１０は、本発明の一実施形態に係るアンテナ装置の作用・効果を確認するための通信性能の評価結果を示すグラフである。FIG. 10 is a graph showing a communication performance evaluation result for confirming the operation / effect of the antenna device according to the embodiment of the present invention.
　以下、本発明の好適な実施の形態について詳細に説明する。なお、以下に説明する本実施形態は、特許請求の範囲に記載された本発明の内容を不当に限定するものではなく、本実施形態で説明される構成の全てが本発明の解決手段として必須であるとは限らない。 Hereinafter, preferred embodiments of the present invention will be described in detail. The present embodiment described below does not unduly limit the contents of the present invention described in the claims, and all the configurations described in the present embodiment are essential as means for solving the present invention. Not necessarily.
（第１の実施形態）
　まず、本発明の一実施形態に係るアンテナ装置の構成について、図面を使用しながら説明する。図１は、本発明の一実施形態に係るアンテナ装置が適用される無線通信システムの概略構成を示す斜視図であり、図２Ａは、本発明の一実施形態に係るアンテナ装置の概略構成の一例を示す斜視図であり、図２Ｂは、本発明の一実施形態に係るアンテナ装置の概略構成の一例を示す平面図であり、図２Ｃは、図２Ｂに示すアンテナ装置の熱拡散シートを除いた状態を示す平面図である。 (First embodiment)
First, a configuration of an antenna device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a schematic configuration of a wireless communication system to which an antenna device according to an embodiment of the present invention is applied, and FIG. 2A is an example of a schematic configuration of the antenna device according to an embodiment of the present invention. 2B is a plan view showing an example of a schematic configuration of the antenna device according to the embodiment of the present invention, and FIG. 2C is a diagram excluding the heat diffusion sheet of the antenna device shown in FIG. 2B. It is a top view which shows a state.
　本実施形態に係るアンテナ装置１は、電子機器３０に組み込まれ、外部機器と電磁界信号を介して通信する装置であって、例えば、図１に示すようなＲＦＩＤ用の無線通信システム１００に組み込まれて使用される。 The antenna device 1 according to the present embodiment is a device that is incorporated in an electronic device 30 and communicates with an external device via an electromagnetic field signal. For example, the antenna device 1 is incorporated in an RFID wireless communication system 100 as shown in FIG. Used.
　無線通信システム１００は、図１に示すように、電子機器３０に備わるアンテナ装置１と、アンテナ装置１に対するアクセスを行う外部機器となるリーダライタ４０とを含む。ここで、アンテナ装置１とリーダライタ４０とは、図１に示す三次元直交座標系ＸＹＺのＸＹ平面において互いに対向するように配置されているものとする。 As shown in FIG. 1, the wireless communication system 100 includes an antenna device 1 provided in an electronic device 30 and a reader / writer 40 serving as an external device that accesses the antenna device 1. Here, it is assumed that the antenna device 1 and the reader / writer 40 are arranged to face each other on the XY plane of the three-dimensional orthogonal coordinate system XYZ shown in FIG.
　リーダライタ４０は、ＸＹ平面において互いに対向するアンテナ装置１に対して、Ｚ軸方向に磁界を発信する発信器として機能し、具体的には、アンテナ装置１に向けて磁界を発信するアンテナ４１と、アンテナ４１を介して誘導結合されたアンテナ装置１と通信を行う制御基板４２とを備える。 The reader / writer 40 functions as a transmitter that transmits a magnetic field in the Z-axis direction to the antenna devices 1 that face each other in the XY plane, and specifically, an antenna 41 that transmits a magnetic field toward the antenna device 1 And a control board 42 that communicates with the antenna device 1 that is inductively coupled via the antenna 41.
　すなわち、リーダライタ４０は、アンテナ４１と電気的に接続された制御基板４２が配設されている。この制御基板４２には、一又は複数の集積回路チップ等の電子部品からなる制御回路４３が実装されている。この制御回路４３は、アンテナ装置１から受信されたデータに基づいて、各種の処理を実行する。 That is, the reader / writer 40 is provided with a control board 42 electrically connected to the antenna 41. A control circuit 43 made of electronic components such as one or a plurality of integrated circuit chips is mounted on the control board 42. The control circuit 43 executes various processes based on the data received from the antenna device 1.
　例えば、制御回路４３は、アンテナ装置１に対してデータを送信する場合、データを符号化し、符号化したデータに基づいて、所定の周波数（例えば、１３．５６ＭＨｚ）の搬送波を変調し、変調した変調信号を増幅し、増幅した変調信号でアンテナ４１を駆動する。また、制御回路４３は、アンテナ装置１からデータを読み出す場合、アンテナ４１で受信されたデータの変調信号を増幅し、増幅したデータの変調信号を復調し、復調したデータを復号する。 For example, when transmitting data to the antenna device 1, the control circuit 43 encodes the data, modulates a carrier wave of a predetermined frequency (for example, 13.56 MHz) based on the encoded data, and modulates the data. The modulated signal is amplified, and the antenna 41 is driven by the amplified modulated signal. In addition, when reading data from the antenna device 1, the control circuit 43 amplifies the modulation signal of the data received by the antenna 41, demodulates the modulation signal of the amplified data, and decodes the demodulated data.
　なお、制御回路４３では、一般的なリーダライタで用いられる符号化方式及び変調方式が用いられ、例えば、マンチェスタ符号化方式やＡＳＫ（Amplitude Shift Keying）変調方式が用いられている。また、以下では、非接触通信システムにおけるアンテナ装置等について説明をするが、Ｑｉ（チー）等の非接触充電システムについても同様に適用することができるものとする。 The control circuit 43 uses an encoding method and a modulation method used in a general reader / writer. For example, a Manchester encoding method or an ASK (Amplitude Shift Keying) modulation method is used. In the following description, the antenna device and the like in the non-contact communication system will be described, but the same can be applied to a non-contact charging system such as Qi (Chi).
　アンテナ装置１は、図２Ａに示すように、例えば、リーダライタ４０とＸＹ平面において対向するように配置される携帯電話機等の電子機器３０の筐体３２の内部に組み込まれる。本実施形態では、アンテナ装置１は、誘導結合されたリーダライタ４０との間で通信可能となるアンテナコイル１２が実装されたアンテナ基板３を有するアンテナモジュール２と、アンテナコイル１２に流れる電流により駆動し、リーダライタ４０との間で通信を行う通信処理部１３とを備える。 As shown in FIG. 2A, for example, the antenna device 1 is incorporated into a housing 32 of an electronic device 30 such as a mobile phone that is disposed so as to face the reader / writer 40 in the XY plane. In the present embodiment, the antenna device 1 is driven by the antenna module 2 having the antenna substrate 3 on which the antenna coil 12 capable of communicating with the reader / writer 40 that is inductively coupled is mounted, and the current flowing through the antenna coil 12. And a communication processing unit 13 that performs communication with the reader / writer 40.
　アンテナ装置１は、電子機器３０の筐体（導電体）の内部に設けられ、誘導結合されたリーダライタ４０との間で通信を行う。本実施形態では、図２Ａ乃至図２Ｃに示すように、アンテナ装置１は、アンテナコイル１２と、バッテリパック１５と、プリント基板１６と、ＳＩＭスロット１７を有するような携帯端末等で用いられる。 The antenna device 1 is provided inside the housing (conductor) of the electronic device 30 and communicates with the reader / writer 40 that is inductively coupled. In this embodiment, as shown in FIGS. 2A to 2C, the antenna device 1 is used in a portable terminal or the like having an antenna coil 12, a battery pack 15, a printed circuit board 16, and a SIM slot 17.
　アンテナ基板３には、例えば、フレキシブルプリンテッドサーキット等の可撓性の導線１２ａがパターンニング処理等をすることによって形成されるアンテナコイル１２と、アンテナコイル１２と通信処理部１３とを電気的に接続する端子部１４とが実装されている。 For example, an antenna coil 12 formed by a flexible conductive wire 12a such as a flexible printed circuit being subjected to a patterning process, the antenna coil 12 and the communication processing unit 13 are electrically connected to the antenna substrate 3. A terminal portion 14 to be connected is mounted.
　アンテナコイル１２は、リーダライタ４０から発信される磁界を受けると、リーダライタ４０と誘導結合によって磁気的に結合され、変調された電磁波を受信して、端子部１４を介して受信信号を通信処理部１３に供給する機能を有する。アンテナコイル１２は、図２Ａに示すように略矩形状をなし、外形に沿ってアンテナコイル１２の１本の導線１２ａが周回されており、その中心側が開口部１２ｂとなっている。また、アンテナコイル１２は、導線１２ａが周回する主面が通信時にリーダライタ４０と図１に示すＸＹ平面において対向するように配置される。 When the antenna coil 12 receives a magnetic field transmitted from the reader / writer 40, the antenna coil 12 is magnetically coupled to the reader / writer 40 by inductive coupling, receives the modulated electromagnetic wave, and performs communication processing of the received signal via the terminal unit 14. It has a function of supplying to the unit 13. As shown in FIG. 2A, the antenna coil 12 has a substantially rectangular shape. One conductor 12a of the antenna coil 12 is circulated along the outer shape, and the center side thereof is an opening 12b. The antenna coil 12 is arranged so that the main surface around which the conducting wire 12a circulates opposes the reader / writer 40 in the XY plane shown in FIG. 1 during communication.
　通信処理部１３は、アンテナコイル１２に流れる電流により駆動し、リーダライタ４０との間で通信を行う。具体的に、通信処理部１３は、受信された変調信号を復調し、復調したデータを復号して、復号したデータを、当該通信処理部１３が有する内部メモリに書き込む。また、通信処理部１３は、リーダライタ４０に送信するデータを内部メモリから読み出し、読み出したデータを符号化し、符号化したデータに基づいて搬送波を変調し、誘導結合によって磁気的に結合されたアンテナコイル１２を介して変調された電波をリーダライタ４０に送信する。なお、通信処理部１３は、アンテナコイル１２に流れる電力ではなく、電子機器内に組み込まれたバッテリパックや外部電源等の電力供給手段から供給された電力によって駆動してもよい。 The communication processing unit 13 is driven by the current flowing through the antenna coil 12 and communicates with the reader / writer 40. Specifically, the communication processing unit 13 demodulates the received modulation signal, decodes the demodulated data, and writes the decoded data in the internal memory of the communication processing unit 13. The communication processing unit 13 reads the data to be transmitted to the reader / writer 40 from the internal memory, encodes the read data, modulates the carrier wave based on the encoded data, and is magnetically coupled by inductive coupling. The radio wave modulated through the coil 12 is transmitted to the reader / writer 40. Note that the communication processing unit 13 may be driven not by power flowing through the antenna coil 12 but by power supplied from a power supply unit such as a battery pack or an external power source incorporated in the electronic device.
　熱拡散シート２０は、電子機器３０の駆動時に発熱するプリント基板１６を始めとする電子部品と対向する部分における筐体３２に、電子機器３０の内部の熱を拡散させるために、外部機器４０と対向するように電子機器３０の筐体３２の内部に設けられる。具体的には、熱拡散シート２０は、図２Ａ及び図２Ｂに示すように、アンテナコイル１２の外部機器４０との対向面に当該アンテナコイル１２と重畳するように、発熱源となる電子部品（プリント基板）１６に対向する部位に設けられている。熱拡散シート２０として、グラファイトシートや、炭素繊維シート、銅等からなる金属箔をメッシュ状にエッチングしたシールド材等が使用される。熱拡散性や難燃性、耐熱性、発火防止等の機能に優れる点から、熱拡散シート２０としてグラファイトシートを使用することが好ましい。 The thermal diffusion sheet 20 is connected to the external device 40 in order to diffuse the heat inside the electronic device 30 to the housing 32 in a portion facing the electronic component such as the printed circuit board 16 that generates heat when the electronic device 30 is driven. It is provided inside the housing 32 of the electronic device 30 so as to face each other. Specifically, as shown in FIGS. 2A and 2B, the heat diffusion sheet 20 is an electronic component (a heat source) that overlaps the antenna coil 12 on the surface of the antenna coil 12 facing the external device 40. (Printed circuit board) 16 is provided at a portion facing. As the thermal diffusion sheet 20, a graphite sheet, a carbon fiber sheet, a shield material obtained by etching a metal foil made of copper or the like into a mesh shape, or the like is used. It is preferable to use a graphite sheet as the thermal diffusion sheet 20 from the viewpoint of excellent functions such as thermal diffusibility, flame retardancy, heat resistance, and ignition prevention.
　バッテリパック１５は、図２Ａ乃至図２Ｃに示すように、電子機器３０（図１参照）の筐体３２内に設けられ、外部機器となるリーダライタ４０（図１参照）に対向する第１の導電体となる。すなわち、バッテリパック１５は、アンテナモジュール２の通信時にリーダライタ４０に対向する第１の導電体を構成するものである。 As shown in FIGS. 2A to 2C, the battery pack 15 is provided in a housing 32 of the electronic device 30 (see FIG. 1), and is opposed to a reader / writer 40 (see FIG. 1) serving as an external device. It becomes a conductor. That is, the battery pack 15 constitutes a first conductor that faces the reader / writer 40 during communication of the antenna module 2.
　バッテリパック１５は、電気を比較的よく流すので、外部から交流磁界が加わると渦電流が発生し、磁界を跳ね返してしまう。このような外部から交流磁界が加わるときの磁界分布を調べると、リーダライタ４０と対向した第１の導電体となるバッテリパック１５の端部側の磁界が強いという特性を有する。このため、従来では、携帯電話機等の電子機器３０に組み込んだ際に当該電子機器３０の小型化を図りつつ、リーダライタ４０との間で良好な通信特性を確保するために、アンテナモジュール２のアンテナコイル１２を携帯電話機３０の筐体３２内部に設けられたバッテリパック１５の外縁側に設けることが行われていた。 Since the battery pack 15 flows electricity relatively well, when an AC magnetic field is applied from the outside, an eddy current is generated and the magnetic field is rebounded. Examining the magnetic field distribution when an AC magnetic field is applied from the outside, the magnetic field on the end side of the battery pack 15 serving as the first conductor facing the reader / writer 40 is strong. Therefore, conventionally, in order to ensure good communication characteristics with the reader / writer 40 while reducing the size of the electronic device 30 when it is incorporated in the electronic device 30 such as a mobile phone, The antenna coil 12 has been provided on the outer edge side of the battery pack 15 provided in the housing 32 of the mobile phone 30.
　また、電子機器３０の小型化や多機能化に伴い、電子部品等が設けられる局所的な発熱を分散させる目的でグラファイト等の熱拡散シート２０が設けられるものが多くなった。しかしながら、半導体からなるグラファイトシート等の熱拡散シート２０の下側にアンテナコイル１２を設置すると、外部機器４０からの磁束が熱拡散シート２０に遮断されるために、第１の導電体となるバッテリパック１５の外縁側にアンテナコイル１２を設置しても、アンテナとしての十分な通信性能を確保できない場合がある。すなわち、熱拡散シート２０の下側にアンテナコイル１２を設置することによって、バッテリパック１５による磁気シールド効果を利用したアンテナの通信特性を十分に高められないことが懸念される。 Also, along with the downsizing and multi-functionalization of the electronic device 30, there are many cases where the thermal diffusion sheet 20 such as graphite is provided for the purpose of dispersing the local heat generation where the electronic components are provided. However, if the antenna coil 12 is installed under the heat diffusion sheet 20 such as a graphite sheet made of semiconductor, the magnetic flux from the external device 40 is blocked by the heat diffusion sheet 20, so that the battery serving as the first conductor is used. Even if the antenna coil 12 is installed on the outer edge side of the pack 15, sufficient communication performance as an antenna may not be ensured. That is, there is a concern that the antenna communication characteristics using the magnetic shielding effect by the battery pack 15 cannot be sufficiently improved by installing the antenna coil 12 below the thermal diffusion sheet 20.
　そこで、本実施形態に係るアンテナ装置１は、上記課題を解決するために、図２Ａ及び図２Ｂに示すように、熱拡散シート２０には、スリット部１８及び熱拡散シート側開口部１９が設けられることを特徴とする。 Therefore, in order to solve the above problem, the antenna device 1 according to the present embodiment is provided with a slit 18 and a heat diffusion sheet side opening 19 in the heat diffusion sheet 20 as shown in FIGS. 2A and 2B. It is characterized by being able to.
　スリット部１８は、幅方向に対して長さ方向が大きい細隙であり、アンテナコイル１２の開口部１２ｂと重畳する領域から熱拡散シート２０の端部２０ａにかけて形成される。スリット部１８を設けることで、通信時に熱拡散シート２０に流れる渦電流のループを遮断するので、渦電流が生じるのを防止して、通過する磁束の損失を抑制することができる。なお、熱拡散シート２０に渦電流の発生を防止できればよいため、スリット部１８の幅は、特に限定されない。 The slit portion 18 is a slit having a large length direction with respect to the width direction, and is formed from a region overlapping with the opening portion 12b of the antenna coil 12 to the end portion 20a of the thermal diffusion sheet 20. By providing the slit portion 18, the loop of eddy current flowing through the thermal diffusion sheet 20 at the time of communication is interrupted, so that eddy current can be prevented and loss of magnetic flux passing therethrough can be suppressed. Note that the width of the slit portion 18 is not particularly limited because it is only necessary to prevent the generation of eddy currents in the thermal diffusion sheet 20.
　熱拡散シート側開口部１９は、スリット部１８と接続され、アンテナコイル１２の開口部１２ｂと重畳する領域に形成される。これにより、アンテナコイル１２を熱拡散シート２０の下側に設置した場合でも、熱拡散シート側開口部１９内を外部機器４０からの磁束が通過するようになるので、熱拡散シート側開口部１９に当該外部機器４０との通信が可能となる。このため、アンテナコイル１２を熱拡散シート２０の下側に設置した場合でも、良好なＮＦＣアンテナの通信性能を確保することができるようになる。 The heat diffusion sheet side opening 19 is connected to the slit 18 and is formed in a region overlapping with the opening 12 b of the antenna coil 12. Thereby, even when the antenna coil 12 is installed on the lower side of the heat diffusion sheet 20, the magnetic flux from the external device 40 passes through the heat diffusion sheet side opening 19. In addition, communication with the external device 40 becomes possible. For this reason, even when the antenna coil 12 is installed on the lower side of the thermal diffusion sheet 20, it is possible to ensure good communication performance of the NFC antenna.
（第２の実施形態）
　次に、本発明の他の一実施形態に係るアンテナ装置の構成について、図面を使用しながら説明する。図３Ａは、本発明の他の一実施形態に係るアンテナ装置の概略構成の一例を示す斜視図であり、図３Ｂは、本発明の他の一実施形態に係るアンテナ装置の概略構成の一例を示す平面図である。 (Second Embodiment)
Next, a configuration of an antenna device according to another embodiment of the present invention will be described with reference to the drawings. FIG. 3A is a perspective view illustrating an example of a schematic configuration of an antenna device according to another embodiment of the present invention, and FIG. 3B illustrates an example of a schematic configuration of the antenna device according to another embodiment of the present invention. FIG.
　本実施形態に係るアンテナ装置１０１は、前述した課題を解決するために、図３Ａ及び図３Ｂに示すように、熱拡散シート１２０には、スリット部１１８及び熱拡散シート側スリット部１１９が設けられることを特徴とする。 In order to solve the above-described problem, the antenna device 101 according to the present embodiment is provided with a slit portion 118 and a thermal diffusion sheet side slit portion 119 in the thermal diffusion sheet 120 as shown in FIGS. 3A and 3B. It is characterized by that.
　スリット部１１８は、幅方向に対して長さ方向が大きい細隙であり、アンテナコイル１１２の開口部１１２ｂと重畳する領域から熱拡散シート１２０の端部１２０ａにかけて形成される。スリット部１１８を設けることで、通信時に熱拡散シート１２０に流れる渦電流のループを遮断するので、渦電流が生じるのを防止して、通過する磁束の損失を抑制することができる。なお、熱拡散シート１２０に渦電流の発生を防止できればよいため、スリット部１１８の幅は、特に限定されない。 The slit portion 118 is a slit having a large length direction relative to the width direction, and is formed from a region overlapping with the opening portion 112b of the antenna coil 112 to the end portion 120a of the thermal diffusion sheet 120. By providing the slit portion 118, the loop of eddy current flowing through the thermal diffusion sheet 120 during communication is interrupted, so that eddy current can be prevented from being generated and loss of the passing magnetic flux can be suppressed. Note that the width of the slit portion 118 is not particularly limited because it is only necessary to prevent generation of eddy currents in the thermal diffusion sheet 120.
　本実施形態のアンテナ装置１０１は、第１の実施形態のアンテナ装置１と熱拡散シート１２０に形成されるスリット部１１８と接続される空隙部の形状が異なる。すなわち、本実施形態では、図３Ａ及び図３Ｂに示すように、熱拡散シート１２０に形成されるスリット部１１８と接続される空隙部として、幅方向に対して長さ方向が大きい細隙であり、アンテナコイル１１２の開口部１１２ｂの内形に沿って形成される熱拡散シート側スリット部１１９が設けられている。 The antenna device 101 of the present embodiment is different from the antenna device 1 of the first embodiment in the shape of the gap portion connected to the slit portion 118 formed in the heat diffusion sheet 120. That is, in this embodiment, as shown in FIGS. 3A and 3B, the gap portion connected to the slit portion 118 formed in the thermal diffusion sheet 120 is a slit having a large length direction with respect to the width direction. A heat diffusion sheet side slit 119 formed along the inner shape of the opening 112b of the antenna coil 112 is provided.
　熱拡散シート側スリット部１１９は、スリット部１１８との接続箇所から枝分かれして、矩形状のアンテナコイル１１２の開口部１１２ｂの内形のうち、３辺に沿って形成されている。ここで、内形とは、アンテナコイル１１２と、アンテナコイル１１２の開口部１１２ｂとの境界部分のことを言う。また、熱拡散シート側スリット部１１９の幅についても外部機器４０との通信が可能な幅であれば、特に限定されない。 The heat diffusion sheet side slit portion 119 branches off from the connection portion with the slit portion 118 and is formed along three sides of the inner shape of the opening 112b of the rectangular antenna coil 112. Here, the inner shape refers to a boundary portion between the antenna coil 112 and the opening 112b of the antenna coil 112. Further, the width of the thermal diffusion sheet side slit portion 119 is not particularly limited as long as it can communicate with the external device 40.
　このように、熱拡散シート１２０に形成されるスリット部１１８と接続される空隙部として、アンテナコイル１１２の開口部１１２ｂの内形に沿って形成される熱拡散シート側スリット部１１９を設けることによって、熱拡散シート側スリット部１１９内を外部機器４０（図１参照）から発信された磁束が通過するようになる。このため、アンテナコイル１１２を熱拡散シート１２０の下側に設置した場合でも、良好なＮＦＣアンテナの通信性能を確保することができるようになる。また、第１の実施形態と比べて、熱拡散シート１２０に形成されるスリット部１１８と接続される空隙部の面積が小さくなるので、熱拡散シート１２０の熱拡散性の低減を抑制できるようになる。 Thus, by providing the thermal diffusion sheet side slit portion 119 formed along the inner shape of the opening 112b of the antenna coil 112 as a gap portion connected to the slit portion 118 formed in the thermal diffusion sheet 120. The magnetic flux transmitted from the external device 40 (see FIG. 1) passes through the heat diffusion sheet side slit portion 119. For this reason, even when the antenna coil 112 is installed on the lower side of the thermal diffusion sheet 120, it is possible to ensure good communication performance of the NFC antenna. Moreover, since the area of the space | gap part connected with the slit part 118 formed in the thermal diffusion sheet 120 becomes small compared with 1st Embodiment, it can suppress the reduction | decrease in the thermal diffusivity of the thermal diffusion sheet 120. Become.
（第３の実施形態）
　次に、本発明の他の一実施形態に係るアンテナ装置の構成について、図面を使用しながら説明する。図４Ａは、本発明の他の一実施形態に係るアンテナ装置の概略構成の一例を示す斜視図であり、図４Ｂは、本発明の他の一実施形態に係るアンテナ装置の概略構成の一例を示す平面図であり、図４Ｃは、図４ＢのＡ－Ａ断面図である。 (Third embodiment)
Next, a configuration of an antenna device according to another embodiment of the present invention will be described with reference to the drawings. FIG. 4A is a perspective view illustrating an example of a schematic configuration of an antenna device according to another embodiment of the present invention, and FIG. 4B illustrates an example of a schematic configuration of the antenna device according to another embodiment of the present invention. 4C is a cross-sectional view taken along the line AA of FIG. 4B.
　本実施形態に係るアンテナ装置２０１は、前述した課題を解決するために、図４Ａ及び図４Ｂに示すように、熱拡散シート２２０には、スリット部２１８及び熱拡散シート側スリット部２１９が設けられ、かつ、熱拡散シート２２０の一方の面には、スリット部２１８及び熱拡散シート側スリット部２１９の少なくとも一部が貫通して形成される金属シート２２２が更に設けられることを特徴とする。本実施形態では、図４Ｃに示すように、アンテナコイル２１２と熱拡散シート２２０との間に、スリット部２１８及び熱拡散シート側スリット部２１９が貫通して形成される金属シート２２２が設けられる。 In order to solve the above-described problem, the antenna device 201 according to the present embodiment is provided with a slit portion 218 and a thermal diffusion sheet side slit portion 219 in the thermal diffusion sheet 220 as shown in FIGS. 4A and 4B. In addition, one surface of the heat diffusion sheet 220 is further provided with a metal sheet 222 formed by penetrating at least a part of the slit portion 218 and the heat diffusion sheet side slit portion 219. In the present embodiment, as shown in FIG. 4C, a metal sheet 222 is formed between the antenna coil 212 and the heat diffusion sheet 220 so that the slit portion 218 and the heat diffusion sheet side slit portion 219 are formed therethrough.
　スリット部２１８は、幅方向に対して長さ方向が大きい細隙であり、アンテナコイル２１２の開口部２１２ｂと重畳する領域から熱拡散シート２２０の端部２２０ａにかけて形成される。スリット部２１８を設けることで、通信時に熱拡散シート２２０に流れる渦電流のループを遮断するので、渦電流が生じるのを防止して、通過する磁束の損失を抑制することができる。なお、熱拡散シート２２０に渦電流の発生を防止できればよいため、スリット部２１８の幅は、特に限定されない。 The slit portion 218 is a narrow slit whose length direction is larger than the width direction, and is formed from a region overlapping with the opening portion 212b of the antenna coil 212 to the end portion 220a of the thermal diffusion sheet 220. By providing the slit portion 218, the loop of eddy current flowing through the thermal diffusion sheet 220 during communication is interrupted, so that eddy current is prevented from being generated and loss of magnetic flux passing therethrough can be suppressed. Note that the width of the slit portion 218 is not particularly limited because it is only necessary to prevent generation of eddy currents in the thermal diffusion sheet 220.
　本実施形態のアンテナ装置２０１は、第２の実施形態のアンテナ装置１０１に対して、アンテナコイル２１２と熱拡散シート２２０との間に、スリット部２１８及び熱拡散シート側スリット部２１９が貫通して形成されるアルミニウム等からなる金属シート２２２が更に設けられることを特徴とする。本実施形態では、第２の実施形態のアンテナ装置１０１と同様に、図４Ａ及び図４Ｂに示すように、熱拡散シート２２０に形成されるスリット部２１８と接続される空隙部として、アンテナコイル２１２の開口部２１２ｂの内形に沿って形成されるスリットである熱拡散シート側スリット部２１９が設けられている。 In the antenna device 201 of the present embodiment, the slit portion 218 and the heat diffusion sheet side slit portion 219 penetrate between the antenna coil 212 and the heat diffusion sheet 220 with respect to the antenna device 101 of the second embodiment. A metal sheet 222 made of aluminum or the like to be formed is further provided. In the present embodiment, as in the antenna device 101 of the second embodiment, as shown in FIGS. 4A and 4B, the antenna coil 212 is used as a gap portion connected to the slit portion 218 formed in the thermal diffusion sheet 220. There is provided a thermal diffusion sheet side slit 219 which is a slit formed along the inner shape of the opening 212b.
　熱拡散シート側スリット部２１９は、スリット部２１８との接続箇所から枝分かれして、矩形状のアンテナコイル２１２の開口部２１２ｂの内形のうち、３辺に沿って形成されている。ここで、内形とは、アンテナコイル２１２と、アンテナコイル２１２の開口部２１２ｂとの境界部分のことを言う。 The heat diffusion sheet side slit part 219 branches off from the connection part with the slit part 218, and is formed along the three sides of the inner shape of the opening 212b of the rectangular antenna coil 212. Here, the inner shape refers to a boundary portion between the antenna coil 212 and the opening 212b of the antenna coil 212.
　熱拡散シート２２０が半導体であるグラファイトで形成されると、外部機器４０から交流の磁束が加わることによって発生する渦電流が円滑に流れないので、熱として損失して、アンテナコイル２１２のＱ値を低下させることがある。このため、本実施形態では、アンテナコイル２１２と熱拡散シート２２０との間に、スリット部２１８及び熱拡散シート側スリット部２１９が貫通して形成される金属シート２２２が更に設けられることによって、アンテナコイル２１２から直接、熱拡散シート２２０に電流が流れないようにして、アンテナコイル２１２のＱ値の低下が抑制される。 When the thermal diffusion sheet 220 is formed of graphite, which is a semiconductor, an eddy current generated by the application of alternating magnetic flux from the external device 40 does not flow smoothly, so that it is lost as heat and the Q value of the antenna coil 212 is increased. May decrease. For this reason, in this embodiment, the antenna sheet 212 and the heat diffusion sheet 220 are further provided with a metal sheet 222 formed by penetrating the slit portion 218 and the heat diffusion sheet side slit portion 219, thereby providing an antenna. By preventing current from flowing directly from the coil 212 to the thermal diffusion sheet 220, a decrease in the Q value of the antenna coil 212 is suppressed.
　従って、アンテナコイル２１２を熱拡散シート２２０の下側に設置した場合でも、更に良好なＮＦＣアンテナの通信性能を確保することができる。なお、グラファイトからなる熱拡散シート２２０に電流が流れると熱損失になるので、熱拡散シート２２０の方が金属シート２２２よりもスリット部２１８及び熱拡散シート側スリット部２１９のスリット幅を大きくした方が好ましい。 Therefore, even when the antenna coil 212 is installed below the thermal diffusion sheet 220, it is possible to ensure better communication performance of the NFC antenna. In addition, since heat loss occurs when a current flows through the thermal diffusion sheet 220 made of graphite, the thermal diffusion sheet 220 has a larger slit width of the slit portion 218 and the thermal diffusion sheet side slit portion 219 than the metal sheet 222. Is preferred.
　なお、本実施形態では、アンテナコイル２１２と熱拡散シート２２０との間に、スリット部２１８及び熱拡散シート側スリット部２１９が貫通して形成される金属シート２２２が更に設けられるが、電子機器３０（図１参照）の筐体２３２が金属製の場合には、本実施形態における金属シート２２２としてアンテナコイル２１２のＱ値低下を抑制する機能を有する。このため、熱拡散シート２２０のアンテナコイル２１２に対向する面と反対の面に有する金属筐体２３２にスリット部２１８及び熱拡散シート側スリット部２１９を設けてもよい。 In this embodiment, a metal sheet 222 formed by penetrating the slit portion 218 and the heat diffusion sheet side slit portion 219 is further provided between the antenna coil 212 and the heat diffusion sheet 220. When the housing 232 (see FIG. 1) is made of metal, the metal sheet 222 in the present embodiment has a function of suppressing a decrease in the Q value of the antenna coil 212. For this reason, you may provide the slit part 218 and the thermal diffusion sheet side slit part 219 in the metal housing | casing 232 which has the surface opposite to the surface facing the antenna coil 212 of the thermal diffusion sheet 220. FIG.
　また、第２の実施形態と同様に、熱拡散シート２２０に形成されるスリット部２１８と接続される空隙部として、アンテナコイル２１２の開口部２１２ｂの内形に沿って形成される熱拡散シート側スリット部２１９を設けることによって、熱拡散シート側スリット部２１９内を外部機器４０（図１参照）から発信された磁束が通過するようになる。このため、アンテナコイル２１２を熱拡散シート２２０の下側に設置した場合でも、良好なＮＦＣアンテナの通信性能を確保することができるようになる。また、第１の実施形態と比べて、熱拡散シート２２０に形成されるスリット部２１８と接続される空隙部の面積が小さくなるので、熱拡散シート２２０の熱拡散性の低減を抑制できるようになる。 Similarly to the second embodiment, the heat diffusion sheet side formed along the inner shape of the opening 212b of the antenna coil 212 as a gap portion connected to the slit portion 218 formed in the heat diffusion sheet 220. By providing the slit portion 219, the magnetic flux transmitted from the external device 40 (see FIG. 1) passes through the heat diffusion sheet side slit portion 219. For this reason, even when the antenna coil 212 is installed on the lower side of the thermal diffusion sheet 220, it is possible to ensure good communication performance of the NFC antenna. Moreover, since the area of the space | gap part connected with the slit part 218 formed in the thermal diffusion sheet 220 becomes small compared with 1st Embodiment, it can suppress the reduction | decrease in the thermal diffusivity of the thermal diffusion sheet 220. FIG. Become.
　なお、前述した他の一実施形態に係る熱拡散シート１２０、２２０に形成されるスリット部１１８、２１８と接続される空隙部として、アンテナコイル１１２、２１２の開口部１１２ｂ、２１２ｂの内形に沿って形成される熱拡散シート側スリット部１１９、２１９の形成態様は、前述した態様に限定されない。熱拡散シート側スリット部１１９、２１９の変形例について、以下、図面を使用しながら説明する。 In addition, along the inner shape of the openings 112b and 212b of the antenna coils 112 and 212, the gaps connected to the slits 118 and 218 formed in the heat diffusion sheets 120 and 220 according to another embodiment described above. The formation mode of the thermal diffusion sheet side slit portions 119 and 219 formed in this manner is not limited to the above-described mode. Modification examples of the heat diffusion sheet side slit portions 119 and 219 will be described below with reference to the drawings.
　図５Ａ及び図５Ｂ、図６Ａ乃至図６Ｄは、本発明の他の一実施形態に係るアンテナ装置の概略構成の一例を示す平面図である。 5A and 5B and FIGS. 6A to 6D are plan views showing an example of a schematic configuration of an antenna device according to another embodiment of the present invention.
　図５Ａに示すように、本発明の他の一実施形態に係るアンテナ装置３０１では、熱拡散シート３２０の端部３２０ａから形成されるスリット部３１８と接続される熱拡散シート側スリット部３１９は、矩形状のアンテナコイル３１２の開口部３１２ｂの内形のうち、４辺に沿って形成される。すなわち、熱拡散シート側スリット部３１９は、図５Ａに示すように、矩形状のアンテナコイル３１２の開口部３１２ｂの各辺に沿って形成される。なお、このとき、４辺にスリットを入れるとアンテナコイル３１２の開口部３１２ｂに重畳する熱拡散シート３２０の部分が分離してしまう虞があるので、４辺のスリットのうち、１辺（図５Ａでは、アンテナコイル３１２の開口部３１２ｂと重畳する領域から熱拡散シート３２０の端部３２０ａにかけて形成されるスリット部３１８との接続部と対向する辺に沿ったスリット）において、スリットのない領域３１９ａを設けておく。 As shown in FIG. 5A, in the antenna device 301 according to another embodiment of the present invention, the thermal diffusion sheet side slit portion 319 connected to the slit portion 318 formed from the end portion 320a of the thermal diffusion sheet 320 is The inner shape of the opening 312b of the rectangular antenna coil 312 is formed along four sides. That is, the thermal diffusion sheet side slit 319 is formed along each side of the opening 312b of the rectangular antenna coil 312 as shown in FIG. 5A. At this time, if slits are provided on the four sides, the portion of the heat diffusion sheet 320 that overlaps the opening 312b of the antenna coil 312 may be separated, so one of the four sides (FIG. 5A). Then, a slit-free region 319a is defined in a slit along a side facing the connecting portion with the slit portion 318 formed from the region overlapping the opening 312b of the antenna coil 312 to the end portion 320a of the thermal diffusion sheet 320. Keep it.
　しかしながら、図５Ｂに示すアンテナ装置３０２のように、熱拡散シート３２１を樹脂等でコーティングする場合には、アンテナコイル３１２内部の熱拡散シート３２１が分離する虞がないため、熱拡散シート側スリット部３１９ｂとして、アンテナコイル３１２の４辺全てにスリットを入れても良い。このように、熱拡散シート３２１の端部３２１ａから形成されるスリット部３１８と接続される熱拡散シート側スリット部３１９ｂが略矩形状のアンテナコイル３１２の開口部３１２ａの内形に沿って形成されることによって、熱拡散シート側スリット部３１９ｂ内を磁束が通過するようになるので、アンテナコイル３１２を熱拡散シート３２１の下側に設置した場合でも、良好なＮＦＣアンテナの通信性能を確保することができる。 However, when the thermal diffusion sheet 321 is coated with a resin or the like as in the antenna device 302 shown in FIG. 5B, there is no possibility that the thermal diffusion sheet 321 inside the antenna coil 312 is separated. As 319b, slits may be formed on all four sides of the antenna coil 312. Thus, the heat diffusion sheet side slit portion 319b connected to the slit portion 318 formed from the end portion 321a of the heat diffusion sheet 321 is formed along the inner shape of the opening 312a of the substantially rectangular antenna coil 312. As a result, magnetic flux passes through the thermal diffusion sheet side slit portion 319b, so that even when the antenna coil 312 is installed under the thermal diffusion sheet 321, good communication performance of the NFC antenna is ensured. Can do.
　また、図６Ａに示すアンテナ装置４０１では、熱拡散シート４２０の端部４２０ａから形成されるスリット部４１８と接続される拡散シート側スリット部４１９は、アンテナコイル４１２の上辺側の内形に沿って形成される。一方、図６Ｂに示すアンテナ装置５０１では、熱拡散シート５２０の端部５２０ａから形成されるスリット部５１８と接続される熱拡散シート側スリット部５１９は、アンテナコイル５１２の開口部５１２ｂの中間領域を縦断するように形成される。また、図６Ｃに示すアンテナ装置６０１では、熱拡散シート６２０の端部６２０ａから形成されるスリット部６１８と接続される熱拡散シート側スリット部６１９は、アンテナコイル６１２の下辺側の内形に沿って形成される。さらに、図６Ｄに示すアンテナ装置７０１では、熱拡散シート７２０の端部７２０ａから形成されるスリット部７１８と接続される熱拡散シート側スリット部７１９は、アンテナコイル７１２の開口部７１２ｂの中間領域の縦方向と横方向のそれぞれを縦断する十字状に形成される。 In addition, in the antenna device 401 shown in FIG. 6A, the diffusion sheet side slit portion 419 connected to the slit portion 418 formed from the end portion 420 a of the heat diffusion sheet 420 is along the inner shape on the upper side of the antenna coil 412. It is formed. On the other hand, in the antenna device 501 shown in FIG. 6B, the thermal diffusion sheet side slit portion 519 connected to the slit portion 518 formed from the end portion 520a of the thermal diffusion sheet 520 has an intermediate region of the opening portion 512b of the antenna coil 512. It is formed to cut vertically. In the antenna device 601 shown in FIG. 6C, the heat diffusion sheet side slit portion 619 connected to the slit portion 618 formed from the end portion 620 a of the heat diffusion sheet 620 follows the inner shape of the lower side of the antenna coil 612. Formed. Further, in the antenna device 701 shown in FIG. 6D, the thermal diffusion sheet side slit portion 719 connected to the slit portion 718 formed from the end portion 720 a of the thermal diffusion sheet 720 is an intermediate region of the opening 712 b of the antenna coil 712. It is formed in a cross shape that cuts in the vertical and horizontal directions.
　このように、アンテナコイル４１２、５１２、６１２、７１２の開口部４１２ｂ、５１２ｂ、６１２ｂ、７１２ｂと重畳する領域に形成されていれば、熱拡散シート側スリット部内を磁束が通過するようになる。すなわち、スリット部４１８、５１８，６１８、７１８と接続される熱拡散シート側スリット部４１９、５１９、６１９、７１９が略矩形状のアンテナコイル４１２、５１２、６１２、７１２の開口部４１２ｂ、５１２ｂ、６１２ｂ、７１２ｂの内形に沿って形成されていなくても、アンテナコイル４１２、５１２、６１２、７１２の開口部４１２ｂ、５１２ｂ、６１２ｂ、７１２ｂと重畳する領域に形成されていれば、熱拡散シート側スリット部内を磁束が通過するようになる。 Thus, if it is formed in the region overlapping with the openings 412b, 512b, 612b, 712b of the antenna coils 412, 512, 612, 712, the magnetic flux passes through the slit portion on the thermal diffusion sheet side. That is, the thermal diffusion sheet side slit portions 419, 519, 619, and 719 connected to the slit portions 418, 518, 618, and 718 are substantially rectangular openings 412b, 512b, and 612b of the antenna coils 412, 512, 612, and 712. Even if it is not formed along the inner shape of 712b, if it is formed in the region overlapping with the openings 412b, 512b, 612b, 712b of the antenna coils 412, 512, 612, 712, the slit on the thermal diffusion sheet side Magnetic flux passes through the part.
　このため、アンテナコイル４１２、５１２、６１２、７１２を熱拡散シート４２０、５２０、６２０、７２０の下側に設置した場合でも、良好なＮＦＣアンテナの通信性能を確保することができる。また、拡散シート側スリット部４１９、５１９、６１９、７１９の形成位置により、磁束が通過する位置が異なってくるため、例えば、外部機器４０との通信位置によって、拡散シート側スリット部４１９、５１９、６１９、７１９の形成位置を調整することができる。 Therefore, even when the antenna coils 412, 512, 612, 712 are installed below the heat diffusion sheets 420, 520, 620, 720, good NFC antenna communication performance can be ensured. Further, since the position where the magnetic flux passes differs depending on the formation position of the diffusion sheet side slit portions 419, 519, 619, 719, for example, depending on the communication position with the external device 40, the diffusion sheet side slit portions 419, 519, The formation positions of 619 and 719 can be adjusted.
　なお、前述した各実施形態のアンテナ装置では、アンテナコイルの形状が矩形状となっているが、アンテナコイルの形状は、矩形状に限定されず、例えば、六角形、八角形等の多角形や、円形、楕円形等の曲線状のアンテナコイルであっても、適用可能である。すなわち、導線が２次元状に巻回して設けられるアンテナコイルであれば、外部機器と誘導結合されるアンテナコイルとして機能するので、本発明の各実施形態に係るアンテナ装置に適用可能である。 In the antenna device of each embodiment described above, the shape of the antenna coil is rectangular. However, the shape of the antenna coil is not limited to a rectangular shape, for example, a polygon such as a hexagon, an octagon, Even an antenna coil having a curved shape such as a circle or an ellipse is applicable. That is, any antenna coil that is provided by winding a conducting wire in a two-dimensional manner functions as an antenna coil that is inductively coupled to an external device, and thus can be applied to the antenna device according to each embodiment of the present invention.
　このように、本発明の各実施形態におけるアンテナ装置では、熱拡散シートのアンテナコイルの開口部と重畳する領域に熱拡散シート側開口部又は熱拡散シート側スリット部の何れかを設けることによって、当該熱拡散シート側開口部又は熱拡散シート側スリット部内を磁束が通過するようになる。このため、アンテナコイルを熱拡散シートの下側に設置した場合でも、良好なＮＦＣアンテナの通信性能を確保することができる。また、かかるアンテナ装置を外部機器と電磁界信号を介して通信可能な電子機器に取り付けることによって、アンテナ装置の設計自由度の向上を図りつつ、外部機器に対する電子機器の良好なアンテナ通信特性を確保できるようになる。 Thus, in the antenna device in each embodiment of the present invention, by providing either the thermal diffusion sheet side opening or the thermal diffusion sheet side slit in the region overlapping the opening of the antenna coil of the thermal diffusion sheet, Magnetic flux comes to pass through the thermal diffusion sheet side opening or the thermal diffusion sheet side slit. For this reason, even when the antenna coil is installed on the lower side of the thermal diffusion sheet, it is possible to ensure good communication performance of the NFC antenna. In addition, by mounting such an antenna device on an electronic device that can communicate with an external device via an electromagnetic field signal, the antenna device can be designed with good antenna communication characteristics while improving the degree of freedom in designing the antenna device. become able to.
　次に、本発明の各実施形態に係るアンテナ装置の検討評価の実施例について、図面を使用しながら説明する。本発明の各実施形態に係るアンテナ装置における作用・効果を以下の実施例１乃至３及び比較例１乃至３を用いて検証した。なお、本発明は、本実施例に限定されるものではない。 Next, an example of examination and evaluation of the antenna device according to each embodiment of the present invention will be described with reference to the drawings. The operations and effects of the antenna device according to each embodiment of the present invention were verified using Examples 1 to 3 and Comparative Examples 1 to 3 below. In addition, this invention is not limited to a present Example.
　まず、本発明の一実施形態に係るアンテナ装置を創作する際における熱拡散シートに設ける空隙部の形状等についての基礎検討評価について、図面を使用しながら説明する。図７Ａ乃至図７Ｃは、本発明の一実施形態に係るアンテナ装置の作用・効果を確認するための評価方法の説明図であり、図７Ａは、グラファイトシートが無い場合のアンテナ装置８０１を示す比較例１の斜視図であり、図７Ｂは、比較例１の断面図であり、図７Ｃは、比較例１の平面図である。また、図８Ａは、比較例２となるアンテナ装置８０２の概略構成の一例を示す斜視図であり、図８Ｂは、比較例２となるアンテナ装置８０２の概略構成の一例を示す平面図である。さらに、図９Ａは、比較例３となるアンテナ装置８０３の概略構成の一例を示す斜視図であり、図９Ｂは、比較例３となるアンテナ装置８０３の概略構成の一例を示す平面図であり、図９Ｃは、図９ＢのＢ－Ｂ断面図である。 First, the basic examination and evaluation of the shape and the like of the gap provided in the heat diffusion sheet when creating the antenna device according to one embodiment of the present invention will be described with reference to the drawings. 7A to 7C are explanatory diagrams of an evaluation method for confirming the operation and effect of the antenna device according to the embodiment of the present invention. FIG. 7A is a comparison showing the antenna device 801 without a graphite sheet. 7 is a perspective view of Example 1, FIG. 7B is a cross-sectional view of Comparative Example 1, and FIG. 7C is a plan view of Comparative Example 1. FIG. 8A is a perspective view illustrating an example of a schematic configuration of an antenna device 802 serving as a comparative example 2, and FIG. 8B is a plan view illustrating an example of a schematic configuration of the antenna device 802 serving as a comparative example 2. Further, FIG. 9A is a perspective view illustrating an example of a schematic configuration of an antenna device 803 serving as a comparative example 3, and FIG. 9B is a plan view illustrating an example of a schematic configuration of an antenna device 803 serving as a comparative example 3. FIG. 9C is a cross-sectional view taken along the line BB in FIG. 9B.
　評価試験では、図７Ａ乃至図７Ｃに示すように、比較例１のアンテナ装置８０１として、１４０ｍｍ×７０ｍｍの筐体基板８３２の上に、７０ｍｍ×６４ｍｍ×４ｍｍのバッテリパック８１５と、プリント基板８１６の上にＳＩＭスロット８１７と４０ｍｍ×３０ｍｍ×０．３ｍｍのアンテナコイル８１２が設けられ、かつ、アンテナコイル８１２の上側にグラファイトシートが無いものを使用した。そして、直径７０ｍｍで２巻きのアンテナコイル８４１を備えるリーダーアンテナ８４０を４５ｍｍの距離でアンテナコイル８１２の直上に置いて、２つのアンテナの中心が一致した位置を原点として、リーダーアンテナ８４０をＸ軸方向に移動させて磁気的結合係数の分布を評価した。 In the evaluation test, as shown in FIGS. 7A to 7C, as the antenna device 801 of Comparative Example 1, a battery pack 815 of 70 mm × 64 mm × 4 mm and a printed circuit board 816 are formed on a 140 mm × 70 mm housing substrate 832. A SIM slot 817 and a 40 mm × 30 mm × 0.3 mm antenna coil 812 are provided on the top of the antenna coil 812, and a graphite sheet is not provided on the upper side of the antenna coil 812. Then, a reader antenna 840 having a diameter of 70 mm and including two antenna coils 841 is placed immediately above the antenna coil 812 at a distance of 45 mm, and the position where the centers of the two antennas coincide with each other is set as the origin, and the reader antenna 840 is set in the X-axis direction. The distribution of magnetic coupling coefficient was evaluated.
　また、評価試験では、図８Ａ及び図８Ｂに示すように、比較例２のアンテナ装置８０２として、１４０ｍｍ×７０ｍｍの筐体基板８３２の上に、７０ｍｍ×６４ｍｍ×４ｍｍのバッテリパック８１５と、プリント基板８１６の上にＳＩＭスロット８１７と４０ｍｍ×３０ｍｍ×０．３ｍｍのアンテナコイル８１２が設けられ、かつ、アンテナコイル８１２の上側に０．０６ｍｍ厚で開口部のないグラファイトシート８２０を配置したものを使用した。そして、同様にしてリーダーアンテナ８４０をＸ軸方向に移動させて磁気的結合係数の分布を評価した。 Further, in the evaluation test, as shown in FIGS. 8A and 8B, as the antenna device 802 of Comparative Example 2, a battery pack 815 of 70 mm × 64 mm × 4 mm on a 140 mm × 70 mm casing substrate 832, and a printed board A SIM slot 817 and a 40 mm × 30 mm × 0.3 mm antenna coil 812 are provided on 816, and a 0.06 mm thick graphite sheet 820 having no opening is disposed on the upper side of the antenna coil 812. . Similarly, the reader antenna 840 was moved in the X-axis direction to evaluate the magnetic coupling coefficient distribution.
　さらに、評価試験では、図９Ａ乃至図９Ｃに示すように、比較例３のアンテナ装置８０３として、１４０ｍｍ×７０ｍｍの筐体基板８３２の上に、７０ｍｍ×６４ｍｍ×４ｍｍのバッテリパック８１５と、プリント基板８１６の上にＳＩＭスロット８１７と４０ｍｍ×３０ｍｍ×０．３ｍｍのアンテナコイル８１２が設けられ、かつ、アンテナコイル８１２の上側に０．０６ｍｍ厚でアンテナコイル８１２の外形と同じ大きさの開口部８２２が形成されたグラファイトシート８２１を配置したものを使用した。そして、同様にしてリーダーアンテナ８４０をＸ軸方向に移動させて磁気的結合係数の分布を評価した。 Further, in the evaluation test, as shown in FIGS. 9A to 9C, as the antenna device 803 of Comparative Example 3, a battery pack 815 of 70 mm × 64 mm × 4 mm and a printed circuit board are formed on a housing substrate 832 of 140 mm × 70 mm. A SIM slot 817 and a 40 mm × 30 mm × 0.3 mm antenna coil 812 are provided on 816, and an opening 822 having a thickness of 0.06 mm and the same size as the outer shape of the antenna coil 812 is provided above the antenna coil 812. What formed the graphite sheet 821 was used. Similarly, the reader antenna 840 was moved in the X-axis direction to evaluate the magnetic coupling coefficient distribution.
　また、評価試験では、本発明の第１の実施形態に係るアンテナ装置１を実施例１として、同様にしてリーダーアンテナ８４０をＸ軸方向に移動させて磁気的結合係数の分布を評価した。実施例１のアンテナ装置１として、１４０ｍｍ×７０ｍｍの筐体基板３２の上に、７０ｍｍ×６４ｍｍ×４ｍｍのバッテリパック１５と、プリント基板１６の上にＳＩＭスロット１７と４０ｍｍ×３０ｍｍ×０．３ｍｍのアンテナコイル１２が設けられ、かつ、アンテナコイル１２の上側に０．０６ｍｍ厚でアンテナ開口部１２ｂの中心側に１０ｍｍ角の開口部１９が形成され、その端部２０ａまで０．５ｍｍのスリット部１８で接続したグラファイトシート２０を配置したものを使用した。 Further, in the evaluation test, the antenna device 1 according to the first embodiment of the present invention was used as Example 1, and the reader antenna 840 was moved in the X-axis direction in the same manner to evaluate the distribution of the magnetic coupling coefficient. As the antenna device 1 of the first embodiment, a battery pack 15 of 70 mm × 64 mm × 4 mm on a housing substrate 32 of 140 mm × 70 mm, a SIM slot 17 and 40 mm × 30 mm × 0.3 mm of a printed circuit board 16 are provided. An antenna coil 12 is provided, and an opening 19 having a thickness of 0.06 mm is formed on the upper side of the antenna coil 12 and a 10 mm square is formed on the center side of the antenna opening 12b. The graphite sheet 20 connected in the above was used.
　さらに、評価試験では、本発明の第２の実施形態に係るアンテナ装置１０１を実施例２として、同様にしてリーダーアンテナ８４０をＸ軸方向に移動させて磁気的結合係数の分布を評価した。実施例２のアンテナ装置１０１として、１４０ｍｍ×７０ｍｍの筐体基板１３２の上に、７０ｍｍ×６４ｍｍ×４ｍｍのバッテリパック１１５と、プリント基板１１６の上にＳＩＭスロット１１７と４０ｍｍ×３０ｍｍ×０．３ｍｍのアンテナコイル１１２が設けられ、かつ、アンテナコイル１１２の上側に０．０６ｍｍ厚でアンテナコイル１１２の開口部１１２ｂの内形に添って０．５ｍｍ幅の熱拡散シート側スリット部１１９が形成され、その端部１２０ａまで０．５ｍｍのスリット部１１８で接続したグラファイトシート１２０を配置したものを使用した。 Furthermore, in the evaluation test, the antenna device 101 according to the second embodiment of the present invention was used as Example 2, and the reader antenna 840 was moved in the X-axis direction in the same manner to evaluate the distribution of the magnetic coupling coefficient. As the antenna device 101 of the second embodiment, a battery pack 115 of 70 mm × 64 mm × 4 mm on a housing substrate 132 of 140 mm × 70 mm, a SIM slot 117 and 40 mm × 30 mm × 0.3 mm of the printed circuit board 116 are used. An antenna coil 112 is provided, and a heat diffusion sheet side slit 119 having a thickness of 0.06 mm and a width of 0.5 mm is formed on the upper side of the antenna coil 112 along the inner shape of the opening 112b of the antenna coil 112. The one in which the graphite sheet 120 connected to the end portion 120a by the slit portion 118 of 0.5 mm was disposed was used.
　また、評価試験では、本発明の第３の実施形態に係るアンテナ装置２０１を実施例３として、同様にしてリーダーアンテナ８４０をＸ軸方向に移動させて磁気的結合係数の分布を評価した。実施例３のアンテナ装置２０１として、１４０ｍｍ×７０ｍｍの筐体基板２３２の上に、７０ｍｍ×６４ｍｍ×４ｍｍのバッテリパック２１５と、プリント基板２１６の上にＳＩＭスロット２１７と４０ｍｍ×３０ｍｍ×０．３ｍｍのアンテナコイル２１２が設けられ、アンテナコイル２１２の上側に０．０６ｍｍ厚でアンテナコイル２１２の開口部２１２ｂの内形に添って０．５ｍｍ幅の熱拡散シート側スリット部２１９が形成され、その端部２２０ａまで０．５ｍｍのスリット部２１８で接続したグラファイトシート２２０を配置して、かつ、グラファイトシート２２０の下側（ＮＦＣアンテナ側）に同じサイズの５０μのアルミ箔からなり、グラファイトシート２２０と同じスリットが施されている金属シート２２２を貼り付けたものを使用した。 In the evaluation test, the antenna device 201 according to the third embodiment of the present invention was used as Example 3, and the reader antenna 840 was moved in the X-axis direction in the same manner to evaluate the distribution of the magnetic coupling coefficient. As the antenna device 201 of the third embodiment, a battery pack 215 of 70 mm × 64 mm × 4 mm on a case substrate 232 of 140 mm × 70 mm, a SIM slot 217, and 40 mm × 30 mm × 0.3 mm of a printed circuit board 216 are used. An antenna coil 212 is provided, and a heat diffusion sheet side slit 219 having a thickness of 0.06 mm and a width of 0.5 mm is formed on the upper side of the antenna coil 212 along the inner shape of the opening 212b of the antenna coil 212. The graphite sheet 220 connected by a slit portion 218 of 0.5 mm up to 220a is arranged, and the lower side of the graphite sheet 220 (NFC antenna side) is made of an aluminum foil of the same size and has the same slit as the graphite sheet 220. Use a metal sheet 222 with affixed to it. It was.
　図１０は、本発明の一実施形態に係るアンテナ装置の作用・効果を確認するための通信性能の評価結果を示すグラフである。Benchmarkとしての比較例１では、結合係数ｋが０．０１０～０．０１４の間で推移している。これに対して、比較例２では、アンテナコイル８１２の全面がグラファイトシート８２０で覆われているため、リーダーアンテナ８４０からの磁束の多くが遮断されるため、結合係数ｋが０．００２～０．００３の間で推移するように大幅に低減している。一方、比較例３では、グラファイトシート８２１に開口部８２２が形成されているものの、グラファイトシート８２１の端部と接続するスリット部が形成されていないため、結合係数ｋが０．００８～０．０１１の間で推移し、比較例１よりも通信特性が悪い。 FIG. 10 is a graph showing a communication performance evaluation result for confirming the operation / effect of the antenna device according to the embodiment of the present invention. In Comparative Example 1 as a Benchmark, the coupling coefficient k changes between 0.010 and 0.014. On the other hand, in Comparative Example 2, since the entire surface of the antenna coil 812 is covered with the graphite sheet 820, most of the magnetic flux from the reader antenna 840 is blocked, so that the coupling coefficient k is 0.002 to 0.00. It is greatly reduced so as to change between 003. On the other hand, in Comparative Example 3, although the opening portion 822 is formed in the graphite sheet 821, the slit portion connected to the end portion of the graphite sheet 821 is not formed, so that the coupling coefficient k is 0.008 to 0.011. The communication characteristics are worse than those of Comparative Example 1.
　これに対して、実施例１では、結合係数ｋが０．０１１～０．０１６の間で推移しており、Benchmarkとしての比較例１より良好な値となっている。このことから、グラファイトシート２０にスリット部１８と熱拡散シート側開口部１９を設けることによって、熱拡散シート２０に渦電流の発生を防止した上でリーダーアンテナ８４０からの磁束をアンテナコイル１２の開口部１２ｂを通過させられるので、通信特性を良好にできることが分かる。 On the other hand, in Example 1, the coupling coefficient k changes between 0.011 and 0.016, which is a better value than Comparative Example 1 as Benchmark. Therefore, the slit 18 and the heat diffusion sheet side opening 19 are provided in the graphite sheet 20 to prevent the generation of eddy current in the heat diffusion sheet 20, and the magnetic flux from the reader antenna 840 is transferred to the opening of the antenna coil 12. Since the part 12b is allowed to pass, it can be seen that the communication characteristics can be improved.
　また、実施例２では、実施例１と同様に、結合係数ｋが０．０１１～０．０１６の間で推移しており、Benchmarkとしての比較例１より良好な値となっている。このことから、グラファイトシート１２０にスリット部１１８と熱拡散シート側スリット部１１９を設けることによって、熱拡散シート１２０に渦電流の発生を防止した上で、リーダーアンテナ８４０からの磁束をアンテナコイル１１２の開口部１１２ｂを通過させられるので、実施例１と同様に、通信特性を良好にできることが分かる。 In Example 2, as in Example 1, the coupling coefficient k changes between 0.011 and 0.016, which is a better value than Comparative Example 1 as Benchmark. Therefore, by providing the slit portion 118 and the thermal diffusion sheet side slit portion 119 in the graphite sheet 120, the generation of eddy current in the thermal diffusion sheet 120 is prevented, and the magnetic flux from the reader antenna 840 is applied to the antenna coil 112. Since the opening 112b can be passed, it can be seen that the communication characteristics can be improved as in the first embodiment.
　さらに、実施例３では、結合係数ｋが０．０１７～０．０２２の間で推移しており、実施例１及び実施例２よりも良好な値となっている。このことから、グラファイトシート２２０にスリット部２１８と熱拡散シート側スリット部２１９を設け、かつ、グラファイトシート２２０の下側に同じサイズで同じスリットが施されている金属シート２２２を貼り付けることによって、通信特性が大幅に向上することが分かる。このことから、熱拡散シート２２０に渦電流の発生を防止した上で、リーダーアンテナ８４０からの磁束をアンテナコイル２１２の開口部２１２ｂを通過させて、かつ、アンテナコイル２１２のＱ値の低下が抑制されるので、通信特性が大幅に向上することが分かる。 Furthermore, in Example 3, the coupling coefficient k changes between 0.017 and 0.022, which is a better value than Example 1 and Example 2. From this, by attaching the slit part 218 and the thermal diffusion sheet side slit part 219 to the graphite sheet 220, and pasting the metal sheet 222 having the same size and the same slit on the lower side of the graphite sheet 220, It can be seen that the communication characteristics are greatly improved. Therefore, while preventing the generation of eddy currents in the thermal diffusion sheet 220, the magnetic flux from the reader antenna 840 is allowed to pass through the opening 212b of the antenna coil 212, and the decrease in the Q value of the antenna coil 212 is suppressed. Thus, it can be seen that the communication characteristics are greatly improved.
　なお、上記のように本発明の各実施形態及び各実施例について詳細に説明したが、本発明の新規事項及び効果から実体的に逸脱しない多くの変形が可能であることは、当業者には、容易に理解できるであろう。従って、このような変形例は、全て本発明の範囲に含まれるものとする。 Although the embodiments and examples of the present invention have been described in detail as described above, it will be understood by those skilled in the art that many modifications can be made without departing from the novel matters and effects of the present invention. It will be easy to understand. Therefore, all such modifications are included in the scope of the present invention.
　例えば、明細書又は図面において、少なくとも一度、より広義又は同義な異なる用語と共に記載された用語は、明細書又は図面のいかなる箇所においても、その異なる用語に置き換えることができる。また、アンテナ装置及び電子機器の構成、動作も本発明の各実施形態及び各実施例で説明したものに限定されず、種々の変形実施が可能である。 For example, a term described together with a different term having a broader meaning or the same meaning at least once in the specification or the drawings can be replaced with the different term in any part of the specification or the drawings. The configurations and operations of the antenna device and the electronic device are not limited to those described in the embodiments and examples of the present invention, and various modifications can be made.
１、１０１、２０１、３０１、４０１、５０１、６０１、７０１　アンテナ装置、２　アンテナモジュール、３　アンテナ基板、１２、１１２、２１２、３１２、４１２、５１２、６１２、７１２　アンテナコイル、１２ａ　導線、１２ｂ、１１２ｂ、２１２ｂ、３１２ｂ、４１２ｂ、５１２ｂ、６１２ｂ、７１２ｂ　開口部、１３　通信処理部、１４　端子部、１５　バッテリパック、１６　プリント基板、１７　ＳＩＭスロット、１８、１１８、２１８、３１８、４１８、５１８、６１８、７１８　スリット部、１９　熱拡散シート側開口部、２０、１２０、２２０、３２０、４２０、５２０、６２０、７２０　熱拡散シート、３０　電子機器、３２　筐体、４０　リーダライタ（外部機器）、４１　アンテナ、４２　制御基板、４３　制御回路、１１９、２１９、３１９、４１９、５１９、６１９、７１９　熱拡散シート側スリット部、２２２　金属シート 1, 101, 201, 301, 401, 501, 601, 701 antenna device, 2 antenna module, 3 antenna substrate, 12, 112, 212, 312, 412, 512, 612, 712 antenna coil, 12a conductor, 12b, 112b 212b, 312b, 412b, 512b, 612b, 712b opening, 13 communication processing section, 14 terminal section, 15 battery pack, 16 printed circuit board, 17 SIM slot, 18, 118, 218, 318, 418, 518, 618, 718 slit portion, 19 heat diffusion sheet side opening, 20, 120, 220, 320, 420, 520, 620, 720 heat diffusion sheet, 30 electronic device, 32 housing, 40 reader / writer (external device), 41 antenna, 42 Control board, 43 Control circuit, 119,219,319,419,519,619,719 thermal diffusion sheet side slits, 222 metal sheet

Claims (10)

  1. 　電子機器に組み込まれ、外部機器と電磁界信号を介して通信するアンテナ装置であって、
    　導線が２次元状に巻回して設けられ、前記外部機器と誘導結合されるアンテナコイルと、
    　前記アンテナコイルの前記外部機器との対向面に該アンテナコイルと重畳するように設けられる熱拡散シートと、を備え、
    　前記熱拡散シートには、前記アンテナコイルの開口部と重畳する領域から該熱拡散シートの端部にかけて形成されるスリット部と、該スリット部と接続され、前記アンテナコイルの開口部と重畳する領域に形成される熱拡散シート側開口部又は熱拡散シート側スリット部が設けられるアンテナ装置。     An antenna device incorporated in an electronic device and communicating with an external device via an electromagnetic field signal,
    An antenna coil that is provided by winding a conductive wire in a two-dimensional shape and inductively coupled to the external device;
    A thermal diffusion sheet provided on the surface of the antenna coil facing the external device so as to overlap the antenna coil,
    The thermal diffusion sheet has a slit formed from an area overlapping with the opening of the antenna coil to an end of the thermal diffusion sheet, and an area connected to the slit and overlapping with the opening of the antenna coil The antenna apparatus provided with the heat diffusion sheet side opening part or heat diffusion sheet side slit part formed in this.
  2. 　前記スリット部と接続される前記熱拡散シート側スリット部は、前記アンテナコイルの前記開口部の内形に沿って形成される請求項１に記載のアンテナ装置。 The antenna device according to claim 1, wherein the thermal diffusion sheet side slit portion connected to the slit portion is formed along an inner shape of the opening portion of the antenna coil.
  3. 　前記熱拡散シートの一方の面には、前記スリット部及び前記熱拡散シート側スリット部の少なくとも一部が貫通して形成される金属シートが更に設けられる請求項１に記載のアンテナ装置。 2. The antenna device according to claim 1, wherein a metal sheet is further provided on one surface of the heat diffusion sheet so that at least a part of the slit portion and the slit portion on the heat diffusion sheet side is formed therethrough.
  4. 　前記熱拡散シートの一方の面には、前記スリット部及び前記熱拡散シート側スリット部の少なくとも一部が貫通して形成される金属シートが更に設けられる請求項２に記載のアンテナ装置。 3. The antenna device according to claim 2, wherein a metal sheet formed by penetrating at least a part of the slit portion and the slit portion on the heat diffusion sheet side is further provided on one surface of the heat diffusion sheet.
  5. 　前記アンテナコイルの前記開口部は、矩形状であり、前記熱拡散シート側スリット部は、該開口部の内形のうち３辺に沿って形成される請求項２乃至４の何れか１項に記載のアンテナ装置。 The said opening part of the said antenna coil is a rectangular shape, The said heat diffusion sheet side slit part is formed in any one of the Claims 2 thru | or 4 formed along three sides among the inner shapes of this opening part. The antenna device described.
  6. 　前記アンテナコイルの前記開口部は、矩形状であり、前記熱拡散シート側スリット部は、該開口部の内形のうち４辺に沿って形成される請求項２乃至４の何れか１項に記載のアンテナ装置。 The said opening part of the said antenna coil is a rectangular shape, The said heat diffusion sheet side slit part is formed in any one of the Claims 2 thru | or 4 formed along four sides among the inner shapes of this opening part. The antenna device described.
  7. 　前記熱拡散シートは、グラファイトから形成される請求項１乃至４の何れか１項に記載のアンテナ装置。 The antenna device according to any one of claims 1 to 4, wherein the thermal diffusion sheet is made of graphite.
  8. 　前記熱拡散シートは、グラファイトから形成される請求項５に記載のアンテナ装置。 The antenna device according to claim 5, wherein the thermal diffusion sheet is formed of graphite.
  9. 　前記熱拡散シートは、グラファイトから形成される請求項６に記載のアンテナ装置。 The antenna device according to claim 6, wherein the thermal diffusion sheet is made of graphite.
  10. 　請求項１乃至９の何れか１項に記載のアンテナ装置が組み込まれ、外部機器と電磁界信号を介して通信可能な電子機器。 An electronic device in which the antenna device according to any one of claims 1 to 9 is incorporated and can communicate with an external device via an electromagnetic field signal.
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